<prompt> Methylphenindate is drug of choice forObsessive compulsive disorderADHD attention deficit hypersensitivity disorderEnuresisAutism  <response>: Ans. b ADHD. Ref. Pharmacology by KD Tripathi 5th- 436; Harrison 18th27, 369Drugs used for ADHD Methylphenidate Amphetamine PimolineMethylphenidate acts by releasing NA dopamine in brain. It is preferred because it causes less tachycardia growth retardation. 