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
Osteomalacia is adverse effect of : 
Select and explain. 
A. Primidone, B. Phenytoin, C. Carbamazepine, D. Valproic acid
B: Phenytoin
Answer: B: Phenytoin 
Explanation: None