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': 'Anterior fontanelle closes at ____________ \nSelect and explain. \nA. < 3months, B. 12months, C. 12-18months, D. > 3years', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The posterior fontanelle generally closes 2 to 3 months after bih; The sphenoidal fontanelle is the next toclose around 6 months after bih; The mastoid fontanelle closes next from 6 to 18 months after bih; and. The anterior fontanelle is generally the last to close between 10-24 months. Ref : Nelson paediatrics Chapter : Growth and development', 'role': 'assistant'}]