This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous General Anesthesia, Subject name: Anaesthesia
Absolute contraindication to thiopentone: 
Select and explain. 
A. Cardiotoxicity, B. Acute intermittent phorphyria, C. Malignant hyperthermia, D. Methhemoglobinemia
B: Acute intermittent phorphyria
Answer: B: Acute intermittent phorphyria 
Explanation: Ans. (b) Acute intermittent phorphyriaMust Know* Thiopentone is C/I in acute intermittent porphyria.* Etomidate is C/I in adrenal insufficiency.* LA which causes meth hemoglobinemia: Prilocaine* Malignant hyperthermia is caused by: Succinylcholine* DOC for malignant hyperthermia: Dantrolene