This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
[{'content': "Closure of the anterior fontanelle is delayed in all except – \nSelect and explain. \nA. Down's syndrome, B. Osteogenesis imperfecta, C. Hypogonadism, D. Hypothyroidism", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Delayed closure of anterior fontanel / wide (large) anterior fontanel\n\nThe anterior fontanel nonnally closes between 12 to 18 months of age.\nThe presence of excessively large anterior fontanel and its delayed closure is a recognised clinical feature in following conditions.', 'role': 'assistant'}]