A patient on antipsychotic for past four weeks is brought to the emergency with complaint of acute onset of fever, excessive sweating confusion, rigidity of limbs and decreased communication.Examination reveals Temperature of of 140 Degree F, P/R - 120/min BP - 150/100 with disorientation.What is the most probable diagnosis -

• A. Dystonia
• B. Neurolept malignant syndrome
• C. Lithium toxicity
• D. Aggrevation of psychosis