This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Osteology, Subject name: Anatomy
[{'content': 'Endochondral ossification is seen in - \nSelect and explain. \nA. Long bones, B. Flat bones of skull, C. vault of skull, D. Nasal bones', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Endochondral ossification : Bone formation within cailage (hyaline cailage) Long bones which undergo Endochondral ossification : TYPES OF OSSIFICATION: 1. Endochondral ossification - Most long bones. 2. Intramembranous ossification - Flat skull bones/Vault bones. 3. Both Endochondral and intramembranous - Clavicle & Mandible (intramembranous> Endochondral)', 'role': 'assistant'}]