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
For phenytoin all are true except? 
Select and explain. 
A. Cause hirsuitism, B. Teratogenic effect, C. Narrow therapeutic index, D. Does not need drug dosage monitoring
D: Does not need drug dosage monitoring
Answer: D: Does not need drug dosage monitoring 
Explanation: None