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
Which of the following is not a feature of hypothyroidism ? 
Select and explain. 
A. Mental retardation, B. Large head, C. Calf muscle hyperophy, D. Microcephaly
D: Microcephaly
Answer: D: Microcephaly 
Explanation: 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