This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Molecular Biology Techniques, Subject name: Biochemistry
Which of following techniques is used for detection of variation in DNA sequence and Gene expression? 
Select and explain. 
A. Northern blot, B. Southern blot, C. Western blot, D. Microarray
D: Microarray
Answer: D: Microarray 
Explanation: Ans. D. Microarray(Ref: Robbins 9/e page177,178)DNA microarray can be used to detect DNA sequence variationsRNA Microarray can detect Gene expression.