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: Dental
TMJ develops at the age of 
Select and explain. 
A. 18 weeks, B. 10 weeks, C. 6 weeks, D. 29 weeks
B: 10 weeks
Answer: B: 10 weeks 
Explanation: TMJ develops at 8-12 weeks of gestation. It is the last joint to develop in the body.
The work in the above quoted article establishes three phases in TMJ development:
(1) the blastematic stage (weeks 7-8 of development);
(2) the cavitation stage (weeks 9-11 of development); and
(3) the maturation stage (after week 12 of development).
This study identifies the critical period of TMJ morphogenesis as occurring between weeks 7 and 11 of development.