You are answering a USMLE-style medical question. Question: A 36-year-old nursing home worker presents to the clinic with the complaints of breathlessness, cough, and night sweats for the past 2 months. She further expresses her concerns about the possibility of contracting tuberculosis as one of the patients under her care is being treated for tuberculosis. A PPD skin test is done and reads 11 mm on day 3. Chest X-ray demonstrates a cavitary lesion in the right upper lobe. The standard anti-tuberculosis medication regimen is started. At a follow-up appointment 3 months later the patient presents with fatigue. She has also been experiencing occasional dizziness, weakness, and numbness in her feet. Physical exam is positive for conjunctival pallor. Lab work is significant for a hemoglobin level of 10 g/dL and mean corpuscular volume of 68 fl. What is the most likely cause of her current symptoms? Options: A) Inhibition of ferrochelatase B) Increased homocysteine degradation C) Increased GABA production D) Decreased ALA synthesis Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.