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': 'A 30 year old man who was recently started on haloperidol 30mg/day developed hyperpyrexia, muscle rigidity, akinesia, mutism, sweating, tachycardia and increased blood pressure. The investigations showed increased WBC count, increased creatinine phosphokinase. There is no history of any other drug intake or any signs of infection. The most likely diagnosis - \nSelect and explain. \nA. Drug overdose, B. Neuroleptic malignant syndrome, C. Drug induce Parkinsonism, D. Tardive dyskinesia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Features of neuroleptic malignant syndrome \n\nMarked muscular rigidity\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0\xa0\xa0\nHigh fever\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0\nAutonomic instability\xa0(↑\xa0HR & BP, Sweating)\xa0\xa0\nDisturbed consciousness\xa0\xa0\xa0\nCatatonia & stupor\nLeucocytosis \xa0\xa0\xa0\xa0\nIncreased CPK\xa0\xa0\xa0\nMyoglobinemia & Myoglobinuria', 'role': 'assistant'}]