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
Which of the following attains adult size before bih? 
Select and explain. 
A. Ear ossicles, B. Maxilla, C. Mastoid process, D. Parietal bone
A: Ear ossicles
Answer: A: Ear ossicles 
Explanation: The ossicles of the middle ear fully ossify in the fouh month of intrauterine lifeThey are the first bones in body to do soRef: Inderbir Singh&;s Human embryology; Tenth edition; Pg 368