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': 'Center of ossification of femur appears at: PGI 07 \nSelect and explain. \nA. 36 weeks, B. 38 weeks, C. 40 weeks, D. 28 weeks', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. 36 weeks', 'role': 'assistant'}]