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: Anatomy
[{'content': 'Posterior fontanelies are osified at the age of : \nSelect and explain. \nA. At term, B. 2 yrs, C. 3 yrs, D. 4 yrs', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e.At term Posterior fontanella closes /ossifies at At term and anterior fontanella ossifies at 18 months', 'role': 'assistant'}]