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: Forensic Medicine
[{'content': 'Closure of coronal sutures stas at age of : \nSelect and explain. \nA. 20 years, B. 21 years, C. 30-35 years, D. 50-60 years', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. 30-35', 'role': 'assistant'}]