This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Pharmacology, Subject name: Pharmacology
Which of the following drug causes hirsutism? 
Select and explain. 
A. Phenytoin, B. Valproate, C. Carbamazepine, D. Phenobarbitone
A: Phenytoin
Answer: A: Phenytoin 
Explanation: Ans. is 'a' i.e., Phenytoin Adverse effect of phenvtoinAt therapeutic levelAt high plasma levela) Hypertrophy of gum-commonest* in 20%a) Cerebellar and vestibular manifestationb) Hirsutism, coarsening of facial features*o Ataxia*c) Hypersensitivity reactions, these include*-o Vertigoo Rasheso Diplopiao DLEo Nystagmuso Lymphadenopathyb) Epigastric pain, vomiting, nauseao Neutropeniac) LV. Injection causes local vascular injuryd) Hyperglycemia*-it inhibits release of insulind) Fall in B.P.* and cardiac arrythmiase) Hydantoin syndrome*-(fetal)e) Drowsiness & mental contusionsf) Megaloblastic anemia*