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161933 Psychiatry

A patient with acute psychosis, who is on haloperidol 20mg/day for last 2 days, has an episode characterized by tongue protrusion, oculogyric crisis, stiffness and abnormal posture of limbs and trunk without loss of consciousness for last 20 minutes before presenting to casualty. This improved within a few minutes after administration of diphenhydramine HCl. The most likely diagnosis is

AAcute dystonia
BAkathisia
CTardive dyskinesia
DNeuroleptic malignant syndrome
Psychiatry
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