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: Anatomy
[{'content': 'Number of ossification centres in femur is: \nSelect and explain. \nA. 2, B. 4, C. 5, D. 7', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The femur ossifies from five centres: in the shaft, head, greater and lesser trochanters and the distal end. Other than the clavicle, it is the first long bone to ossify.', 'role': 'assistant'}]