This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anesthesia for Neurosurgery, Subject name: Anaesthesia
Which of the following anesthetic agent is contraindicated in a patient with raised intracranial pressure: 
Select and explain. 
A. Etomidate, B. Thiopentone, C. Propofol, D. Ketamine
D: Ketamine
Answer: D: Ketamine 
Explanation: Ans. (d) KetamineRef: KDT 6th ed. / 376* Please refer to above explanation.* Ketamine causes increase in all pressure i.e. intracranial, intraocular, intragastric and intravascular pressure.* Therefore, it is not used in raised ICT/IOT & h ypertension as it may increase the pressure to morbid levels.* Anesthetic agents of choice in head injury/increased ICP are:# Thiopentone (cerebro protective)# Propofol# Etomidate (protection against circulatory depression)# Isoflurane