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': 'Western blot technique is done for- \nSelect and explain. \nA. Mitochondiral RNA, B. Double strand DNA, C. r-RNA, D. Protein', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Visualization of a specific DNA or RNA fragment among the many thousand of contaminating molecules requires the convergence of a number of techniques collectively termed the blot transfer.\n\nSouthern blot →\xa0Detects DNA\nNorthern blot →\xa0Detects RNA\nWestern blot →\xa0Detects proteins (proteins are separated by electrophoresis, renatured and analysed for an interaction by hybridization with a specific labelled DNA probe).', 'role': 'assistant'}]