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: Anaesthesia
Following A, a patient suffered splenic ruture. His BP is 90/60 mmHg, PR 126/min and Sp02 92%. Induction agent of choice is 
Select and explain. 
A. Remifentanyl, B. Halothane, C. Midazolam, D. Etomidate
D: Etomidate
Answer: D: Etomidate 
Explanation: D i.e. Etomidate Ketamine and etomidate are most commonly used induction agents for (non head injury) trauma patientsQ. Ketamine is beneficial in patients with acute hypovolemic shock (d/t indirect sympathetic stimulatory effects). Whereas etomidate provides greater cardiovascular stability (ie no or minimal effects on myocardial contractility, cardiac output and cardiovascular system, mild reduction in peripheral vascular resistance and BP, and no histamine release).