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 starts at age of - \nSelect and explain. \nA. 20 years, B. 25 years, C. 30-35 years, D. 50-60 years', 'role': 'user'}, {'content': 'Answer: B \nExplanation: This question is tricky one. Most of the guides have given option c is the answer. Which is incorrect.\nCoronal suture is completely obliterated at 35-40 years. But, read the question carefully, examiner is asking when the closure starts (not completes).\nClosure of coronal, lambdoid and sagittal sutures starts at inner side at 25 years. And it is complete on outer side :-\nSagittal suture → 30-35 years.\nCoronal suture → 35-40 years.\nLambdoid suture → \xa045-50 years.', 'role': 'assistant'}]