This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Adverse Drug Effect, Subject name: Pharmacology
Phacomelia is seen due to which drug? 
Select and explain. 
A. Thalidomide, B. Dexamethasone, C. Chlorambucil, D. Betamethasone
A: Thalidomide
Answer: A: Thalidomide 
Explanation: Ans. is 'a' i.e., Thalidomide * Has been explained in previous sessions