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: Pharmacology
[{'content': 'Long acting barbiturate is ? \nSelect and explain. \nA. Thiopentone, B. Secobarbitone, C. Phenobarbitone, D. Pentobarbitone', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Phenobarbitone Long acting barbiturates -4 Phenobarbitone, Mephobarbitone. Sho acting barbiturates-4 Butobarbitone, secobarbitone, Pentobarbitone. Ultrasho acting -4 Thiopentone, Methohexitone, Hexobarbitone.", 'role': 'assistant'}]