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: Pharmacology
The first centres of ossication appears during which month of pregnancy? 
Select and explain. 
A. At the end of 2 month of pregnancy, B. At the beginning of 3rd month of pregnancy, C. At the end of 3rd  month of pregnancy, D. At the end of 4th month of pregnancy
A: At the end of 2 month of pregnancy
Answer: A: At the end of 2 month of pregnancy 
Explanation: None