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': 'First secondary ossification center appears in \nSelect and explain. \nA. Lower end of femur, B. Upper end of humerus, C. Lower end of fibula, D. Upper end of tibia', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Lower end of femur Site given in question Secondary ossification center appears at Lower end of femur 9th month intrauterine life Upper end of tibia At bih Upper end humerus 1/2 -1 year of age Lower end of fibula 1 year of age", 'role': 'assistant'}]