This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anaesthesia, Subject name: Pharmacology
Which general anaesthetic selectively inhibits excitatory NMDA receptors: 
Select and explain. 
A. Thiopentone, B. Halothane, C. Desflurane, D. Ketamine
D: Ketamine
Answer: D: Ketamine 
Explanation: Ketamine Intravenous inducing agent. Acts by blocking NMDA receptors. Adverse effects : Hallucinations, delirium and vivid dreams are impoant adverse effects that are seen during recovery from anaesthesia (emergence delirium). Has indirect sympathomimetic action = | blood pressure, hea rate and cardiac output Increases intraocular pressure and intracranial tension Appropriate drug for anesthetizing patients , at high risk of bronchospasm