This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti-Psychotic, Subject name: Pharmacology
Methylphenidate is used for: 
Select and explain. 
A. Attention deficit disorder, B. Alzheimer's disease, C. Seizure disorder, D. Obsessive compulsive disorder
A: Attention deficit disorder
Answer: A: Attention deficit disorder 
Explanation: Ans. (a) Attention deficit disorderRef.:KDT 6th ed. / 470* Methylphenidate is the preferred drug for the treatment of attention deficit hyperkinetic disorder (ADHD). Other drugs used for this indication are amphetamines, atomoxetine and pemoline. Pemoline has been withdrawn due to life threatening hepatotoxicity.* Abuse of drugs like amphetamine, phencyclidine, methylphenidate, flumazenil etc. causes seizure and is NOT used for seizure disorder.* DOC for alzheimer's disorder- Rivastigmine/ Donepezil* DOC for OCD: Fluoxetine