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: Biochemistry
[{'content': 'Feulgen reaction is a cytochemical test for the detection of: \nSelect and explain. \nA. DNA, B. m-RNA, C. t-RNA, D. All of the above', 'role': 'user'}, {'content': "Answer: A \nExplanation: Feulgen reaction: It is an aldehyde specific reaction based on the formation of a purple coloured compound when aldehyde reacts with fuchsin-sulfuric acid. It is used in histology to identify chromosomal material or DNA in cell specimens. Ref: DNA Cytometric Analysis By Andre's Sampedro, Page 78", 'role': 'assistant'}]