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
[{'content': 'Teratogenicity results when drugs are given during \nSelect and explain. \nA. First trimester, B. Second trimester, C. Third trimester, D. Soon after birth', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]