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
Regarding ketamine all are true except 
Select and explain. 
A. Ketamine acts on NMDA receptors in brain, B. Indirectly acting sympathomimetic agent, C. Contraindicated in shock, D. Agent of choice in asthma patients.
C: Contraindicated in shock
Answer: C: Contraindicated in shock 
Explanation: Ketamine being sympathomimetic, is agent of choice in shock.