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What are the correct answers
The correct answer is Duchenne muscular dystrophy: X-linked recessive (highlighted in green).
Here's a quick breakdown of all four options and why:
| Myopathy | Given Inheritance | Correct? | Actual Inheritance |
|---|---|---|---|
| Facioscapulohumeral muscular dystrophy | Autosomal recessive | Wrong | Autosomal dominant |
| Limb girdle muscular dystrophy | Autosomal dominant | Wrong | Both AD and AR subtypes exist, but the classic/common form is autosomal recessive |
| Dystrophia myotonica (Myotonic dystrophy) | Autosomal dominant | Wrong | Actually correct - but it was marked in red, likely because the question asked which is "correctly matched," and the app selected DMD as the intended answer |
| Duchenne muscular dystrophy | X-linked recessive | Correct | Yes - X-linked recessive, caused by mutation in the dystrophin gene on the X chromosome |
Wait - a note on the marking: Looking at the image carefully:
- The red border on "Dystrophia myotonica: Autosomal dominant" = the answer the user selected (wrong choice)
- The green border on "Duchenne muscular dystrophy: X-linked recessive" = the correct answer
Why DMD is correct: Duchenne muscular dystrophy is caused by mutations in the dystrophin gene located on the X chromosome (Xp21), making it X-linked recessive. It almost exclusively affects males, with females being carriers.
Why "Dystrophia myotonica: Autosomal dominant" is NOT the best answer here: While myotonic dystrophy IS autosomal dominant (correct pairing), the question likely had DMD as the intended key because it is the most classically tested and unambiguous match. Myotonic dystrophy may have been a distractor designed to mislead.
Sp myotonia dystorphica is correct?
Yes, Dystrophia myotonica (Myotonic dystrophy): Autosomal dominant is also a correct statement factually.
Both of these are true:
- Myotonic dystrophy → Autosomal dominant ✓
- Duchenne muscular dystrophy → X-linked recessive ✓
So two options are factually correct in this question, which makes it a poorly framed question. However, in the context of this MCQ:
- The app marked DMD: X-linked recessive as the "intended" correct answer (green)
- The user selected Myotonic dystrophy: Autosomal dominant (red = marked wrong by the app)
This is a flawed question because myotonic dystrophy being autosomal dominant is absolutely correct. In most standard exams (USMLE, NEET PG), both would be considered correct pairings.
The likely reason the app chose DMD as the "only" correct answer:
- The other two options (Facioscapulohumeral = AR, Limb girdle = AD) are clearly wrong
- Between the two correct ones, DMD is the more "classic" high-yield fact
- The app may simply have only one stored correct answer
Bottom line: Your answer (Myotonic dystrophy: Autosomal dominant) is factually correct. If this appeared on a real exam with only one correct answer, you'd need to flag it as ambiguous.
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