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': 'Phocomelia is an adverse effect due to: \nSelect and explain. \nA. Thalidomide, B. Warfarin, C. Enalapril, D. Phenytoin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Thalidomide', 'role': 'assistant'}]