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
Anaesthetic agent contraindicated in porphyria – a) Thiopentoneb) Propofolc) Ketamined) Etomidale e) Methadone 
Select and explain. 
A. ad, B. c, C. ac, D. ab
A: ad
Answer: A: ad 
Explanation: Barbiturates (Thiopentone) are absolutely contraindicated in prophyria.

Note : Reports about safety of etomidate in prophyria are conflicting. Some books (Miller 7th /e p. 1115) consider it safe and other books (Lee, Wylie) consider it unsafe.