This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: CNS, Subject name: Pharmacology
[{'content': 'A patient on therapy for his CNS illness develops the following abnormality what is the possible cause ? \nSelect and explain. \nA. Anti depressants, B. Anti psychotics, C. Antiepileptics, D. Anti Parkinsonian drugs', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Extrapyramidal symptoms due to D2 blockade in the limbic system are closely related to antipsychotic potency of typical antipsychotic drugs. Acute Muscular dystonia: It is the earliest appearing symptom(within hours)and may manifest as Toicollis, locked jaw, oculogyric crisis or spasm of other muscles. Central anticholinergics are useful in the treatment. Note : Oculogyric crisis is thespasm of the extraocular muscles, causing upward and outward detion of the eyes which is treated by Central anticholinergic agents.', 'role': 'assistant'}]