This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: NEET 2019, Subject name: Pharmacology
[{'content': 'Which of the following anesthetic agent is not painful on intravenous administration? \nSelect and explain. \nA. Ketamine, B. Propofol, C. Etomidate, D. Methohexital', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ketamine: Sho acting, non barbiturate anaesthetic induces a dissociated state in which the patient is unconcious and does not feel pain. This dissociative anaesthesia provide sedation, amnesia and immobility. Not painful on IV administration Propofol: potent anaesthetic but a weak analgesic . Maximum pain on injection. Etomidate:- Hypnotic agent used to induce anaesthetic but lacks analgesic activity. Usually only used for patient with coronary aery diseases or cardiovascular dysfunction. Methohexital:- Barbiturate derivative, sho acting and has rapid onset of action.', 'role': 'assistant'}]