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
Which of the following induction agent may cause adrenal coex suppression? 
Select and explain. 
A. Propofol, B. Ketamine, C. Etomidate, D. Thiopentione
C: Etomidate
Answer: C: Etomidate 
Explanation: Etomidate is an induction anaesthetic which cause suppression of production of steroids from adrenals. It is therefore not suitable for continuous intravenous use. It has brief duration of action (5-10min) and produce little cardiovascular and respiratory depression. It produce prominent motor restlessness and rigidity. Use of etomidate should be restricted to clinical situations in which its hemodynamic stability offers a distinctive advantage over the other available induction drugs (e.g. elderly outpatients with clinically significant coronary aery or cerebrovascular disease). Ref: Essentials of Medical Pharmacology By K D Tripathi, 5th Edition, Pages 342-4