This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Psychiatry
[{'content': 'A31 year old male, with a mood disorder, on 30 mg of haloperidol and 100 mg of lithium, is brought to the hospital emergency room with a history of acute onset of fever, excessive sweating, confusion, the rigidity of limbs and decreased communication for a day. Examination reveals tachycardia and labile blood pressure and investigations reveal increased CPK enzyme levels and leucocytosis. He is likely to have developed - \nSelect and explain. \nA. Lithium toxicity, B. Tardive dyskinesia, C. Neuroleptic malignant syndrome, D. Hypertensive encephalopathy', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Fever, rigidity, excessive sweating, confusion, autonomic instability (labile BP), tachycardia, increased CPK and leucocytosis, in a patient on antipsychotic (Haloperidol), suggest the diagnosis of the neuroleptic malignant syndrome.', 'role': 'assistant'}]