You are answering a USMLE-style medical question. Question: An 8-year-old boy is brought to the physician by his parents for short stature. Neither his clothing nor his shoe size have changed over the past year. He also frequently bumps into obstacles such as furniture and has headaches at night. He is always thirsty for cold water and has been urinating more frequently. Three years ago, he had an asthma attack that was treated with albuterol and a one-week course of steroids. His mother has Hashimoto's thyroiditis and had precocious puberty. His mother's height is 147 cm (4 ft 10 in) and his father's height is 160 cm (5 ft 3 in). He is at the 5th percentile for height and 5th percentile for weight. His temperature is 37°C (98.6°F), pulse is 98/min, respirations are 16/min, and blood pressure is 100/64 mm Hg. Examination shows a soft and nontender abdomen. The genitals and pubic hair are both Tanner stage 1. Axillary hair is absent. Patellar reflexes are 1+ bilaterally. Laboratory studies show: Na+ 145 mEq/L K+ 4.1 mEq/L Cl- 102 mEq/L HCO3- 25 mEq/L Ca2+ 9.4 mg/dL Glucose 110 mg/dL Thyroid-stimulating hormone 0.3 μU/mL Thyroxine 3.9 μg/dL Insulin-like growth factor 1 24 ng/mL (N=61–356 ng/mL) Insulin-like growth factor binding protein 3 2.1 mcg/mL (N=1.6–6.5 μg/mL) Which of the following is the most likely diagnosis?" Options: A) Rathke cleft cyst B) Craniopharyngioma C) Multiple endocrine neoplasia D) Pituitary adenoma Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.