This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Central Nervous system, Subject name: Pharmacology
Antipsychotic drug with least extra pyramidal side effect is: 
Select and explain. 
A. Triflupromazine, B. Thioridazine, C. Pimozide, D. Trifluoperazine
B: Thioridazine
Answer: B: Thioridazine 
Explanation: Extrapyramidal motor disturbances ) are intimately linked to the antipsychotic effect, but are more prominent in the high potency compounds and least in thioridazine, clozapine and other atypical antipsychotics. A predominance of lower frequency waves occurs in EEG and arousal response is dampened. However, no consistent effect on sleep architecture has been noted. The disturbed sleep pattern in a psychotic is normalize Ref: KD Tripati 8th ed.