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
Neural tube defect is an adverse effect of : 
Select and explain. 
A. Valproate, B. Phenytoin, C. Diazoxide, D. None
A: Valproate
Answer: A: Valproate 
Explanation: None