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
The drug which is not suitable for patients with acute porphyria for intravenous induction is: 
Select and explain. 
A. Thiopentone sodium, B. Propofol, C. Midazolam, D. Etomidate
A: Thiopentone sodium
Answer: A: Thiopentone sodium 
Explanation: Ans. is 'a' i.e., Thiopentone sodium It has been repeated so many times that barbiturates can induce fatal attacks of porphyria in patients with acute intermittent or variegate porphyria and are contraindicated in such patients.Also know