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: Pediatrics
[{'content': 'Ossification centre appearing just before bih is: March 2013 \nSelect and explain. \nA. Lower end of femur, B. Lower end of tibia, C. Upper end of humerus, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A i.e. Lower end of femur', 'role': 'assistant'}]