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
Phocomelia is due to teratogenic effect of : 
Select and explain. 
A. Thalidomide, B. Chlorpromazine, C. Methotrexate, D. Carbamazepine
A: Thalidomide
Answer: A: Thalidomide 
Explanation: None