This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti-Psychotic, Subject name: Pharmacology
A female suffering from psychosis, taking phenothiazine's now complains of sudden onset of high grade fever, muscle rigidity and altered sensorium. The diagnosis is : 
Select and explain. 
A. Malignant hyperthermia, B. Neuroleptic malignant syndrome, C. Tardive dyskinesia, D. Akathesia
B: Neuroleptic malignant syndrome
Answer: B: Neuroleptic malignant syndrome 
Explanation: Ans. is 'b' Neuroleptic malignant syndrome History of intake of antipsychotic drugs and high grade fever, muscle rigidity, altered sensorium suggests Neurolept Malignant Syndrome.Neurolept Malignant SyndromeUsually occurs in patients who are extremely sensitive to extrapyramidal effects of antipsychotics.C/F:Marked muscle rigidity *High fever*Increase CPK*Autonomic instability*Severe extrapyramidal syndromes*TreatmentVigorous treatment with antiparkinson drugsDiazepamDantroline*Bromocriptine*