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: Surgery
[{'content': 'TMJ development starts at: \nSelect and explain. \nA. 2 weeks, B. 10 weeks, C. 29 weeks, D. 25 weeks', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Three phases in the development of the TMJ were identified:\n\nThe first is the blastematic stage (weeks 7-8 of development), which corresponds with the onset of the organization of the condyle and the articular disc and capsule. During week 8, intramembranous ossification of the temporal squamous bone begins.\xa0\nThe second stage is the cavitation stage (weeks 9-11 of development), corresponding to the initial formation of the inferior joint cavity (week 9) and the start condylar chondrogenesis. Week 11 marks the initiation of organization of the superior joint cavity.\xa0\nAnd the third stage is the maturation stage (after week 12 of development).', 'role': 'assistant'}]