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
Anterior fontanelle closes at ? 
Select and explain. 
A. 2-3 months, B. 4-7 months, C. 9-12 months, D. 18-24 months
D: 18-24 months
Answer: D: 18-24 months 
Explanation: Ans. is `d' i.e., 18-24 months