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
Fetal hydantoin syndrome is caused by - 
Select and explain. 
A. Phenytoin, B. Alcohol, C. Tetracycline, D. Sodium valproate
A: Phenytoin
Answer: A: Phenytoin 
Explanation: Ans. is 'a' i.e., Phenytoin Fetal hydantoin syndrome is characteristically associated with use of phenytoin in pregnancy.