This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Growth and development, Subject name: Pediatrics
[{'content': 'Which of the following statement is true about the anterior fontanelle? \nSelect and explain. \nA. Size of anterior fontanelle is about 2.5 mm x 2.5 mm, B. It normally closes at bih, C. It must be measured across the borders, D. Early closure is seen in rickets', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Size of anterior fontanelle is 2.5 cm x 2.5 cm. It closes by 18 months. It must be measured across the borders. Delayed closure is seen in hypothyroidism, rickets, trisomy syndromes, intrauterine infections, hypophosphatasia and osteogenesis imperfecta. Ref: Clohey, 8th edition, pg no 103; Dutta Obstetrics, 8th edition, pg no 95', 'role': 'assistant'}]