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
[{'content': 'Red degeneration in a case of fibroid with pregnancy occurs most often during : \nSelect and explain. \nA. First trimester, B. Second trimester, C. Third trimester, D. Puperium', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Second trimester', 'role': 'assistant'}]