This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Central Nervous system, Subject name: Pharmacology
A patient on anti-psychotic drugs develops temperature of 104degC, BP about 150/100 and abnormal behavior. What is the likely diagnosis? 
Select and explain. 
A. Aggravation of psychosis, B. Parkinsonism, C. Dystonia, D. Neuroleptic malignant syndrome
D: Neuroleptic malignant syndrome
Answer: D: Neuroleptic malignant syndrome 
Explanation: Neuroleptic malignant syndrome is characterized by immobility, rigidity, tremors, fever, dysphagia, stupor or coma with autonomic effects like fluctuating BP and HR. It could be due to sudden reduction in dopaminergic or cholinergic action. Ref KD Tripati 8thh ed.