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': 'Which of following techniques analyzing for detection of variations in DNA sequence and Gene expression - \nSelect and explain. \nA. Northern Blot, B. Southern Blot, C. Western Blot, D. Microarray', 'role': 'user'}, {'content': 'Answer: D \nExplanation: DNA microarray (DNA-chips) is used for detection or screening of variations in DNA sequences and gene expression analyzing thousands of gene at the same time.', 'role': 'assistant'}]