This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Pediatrics
[{'content': 'Which of the following is not a feature of hypothyroidism ? \nSelect and explain. \nA. Mental retardation, B. Large head, C. Calf muscle hyperophy, D. Microcephaly', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Hypothyroidism characterized by open and widened fontanelle results in large head and mental retardation. Reference: ghai essential of pediatrics, eighth edition, p.no:517,table 17.6', 'role': 'assistant'}]