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
Anaphylaxis is caused by - 
Select and explain. 
A. N2O, B. Althesin, C. Halothane, D. Propofol
B: Althesin
Answer: B: Althesin 
Explanation: Ans. is 'b' i.e., Aithesin Althesino Althesis is a neurosteriodo It was used as a parenteral anaesthetico It was withdrawn from the market because of several severe anaphylactic reactions