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
Valproic acid causes all except: 
Select and explain. 
A. It is an enzyme inducer, B. It causes obesity, C. It causes hepatotoxicity, D. It causes neural tube defects
A: It is an enzyme inducer
Answer: A: It is an enzyme inducer 
Explanation: None