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: Gynaecology & Obstetrics
Red degeneration most commonly occurs at : 
Select and explain. 
A. 1st trimester, B. Second trimester of pregnancy, C. Third trimester of pregnancy, D. Puerperium
B: Second trimester of pregnancy
Answer: B: Second trimester of pregnancy 
Explanation: Second trimester of pregnancy