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
Long acting barbiturate is ? 
Select and explain. 
A. Thiopentone, B. Secobarbitone, C. Phenobarbitone, D. Pentobarbitone
C: Phenobarbitone
Answer: C: Phenobarbitone 
Explanation: 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.