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: Skin
[{'content': 'Non-pigmenting fixed reactions is caused by: \nSelect and explain. \nA. Sulphonamides, B. Ampicillin, C. Pseudoephedrine, D. Carbamazepine', 'role': 'user'}, {'content': "Answer: C \nExplanation: Non-pigmenting fixed reactions have been repoed with sympathomimetic agents pseudoephedrine, tetryzoline hydrochloride, difunisal, thiopental (thiopentone), piroxicam, Radiopaque contrast medium iothalamate, arsphenamine paracetamol. Ref: Rook's textbook of dermatology, 8th edition, Pg 75.48.", 'role': 'assistant'}]