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
Which of the following inducing agent produces cardiac stability? 
Select and explain. 
A. Etomidate, B. Ketamine, C. Halothane, D. Thiopentone
A: Etomidate
Answer: A: Etomidate 
Explanation: Etomidate 
It is another induction anaesthetic (0.2- 0.5 mg/kg) which has a briefer duration of action  (4-8 min).
than thiopentone; produces little cardiovascular and respiratory depression, but motor restlessness and rigidity is more prominent as are pain on injection or nausea and vomiting on recovery. It is a poor analgesic and has not found much favour ,except for patients with compromised cardiovascular status. 
Reference: Essentials of Medical Pharmacology Eighth Edition KD  TRIPATHI  page no 410