This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'Endochondral ossification is seen in \nSelect and explain. \nA. Clavicle, B. Mandible, C. Nasal bones, D. Flat bones of skull', 'role': 'user'}, {'content': "Answer: A \nExplanation: Long bones and medial end of clavicle bone develop by endochondral ossification Flat bones of skull; facial skeleton; mandible and lateral end of clavicle develop by intramembranous ossification. Ref: Gray's39e/p185-210", 'role': 'assistant'}]