<prompt>  A patient on antipsychotic for past 4 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 104F; PR - 120min, BP-150100 with disorientation. What is the most probable diagnosis -Lithium toxicityAggrevation of psychosisDystoniaNeurolept malignant syndrome 