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 road trafiic accident involving his bike and a bus, a 30-year-old man suffered splenic rupture. On examination his vital signs are BP 90/60, pulse 126/min and Sp02 92%. Which of the following is the induction agent of choice in this patient ? 
Select and explain. 
A. Remifentanyl, B. Halothane, C. Midazolam, D. Etomidate
D: Etomidate
Answer: D: Etomidate 
Explanation: This patient is hemodynamically unstable and the induction agent of choice in this case would be etomidate, as it is preferred in patients with unstable hemodynamics and poor cardiac reserve. Etomidate is an induction agent which is frequently used in elderly patients, trauma victims or in emergency circumstances. Reference: Principles and Practice of Geriatric Surgery edited by Ronnie Ann Rosenthal, page 315.