This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Complications Of Anaesthesia, Subject name: Anaesthesia
Anesthetic agent contraindicated in acute intermittent porphyria is? 
Select and explain. 
A. Halothane, B. Isoflurane, C. Propofol, D. Thiopentone
D: Thiopentone
Answer: D: Thiopentone 
Explanation: Ans. is 'd' i.e., Thiopentone Anesthetics in porphyriaSafeUnsafe (should not be used)* Propofol* Benzodiazepines* Opioids (other than pentazocine)- morphine, codeine, pethidine, fentanyl, alfentanyl, naloxone* Lidocaine, Bupivacaine* Muscle relaxants* Neostagmine, atropine, glycopyrrolate* Aspirin, indomethacin, naproxen* Halothane, N2O, isoflurane* Barbiturate (thiopentone)* Etomidate* Pentazocine* Ropivacaine