Northern blotting is used for detection of

Answer: Option B

Northern blotting is used for the detection of RNA. The northern blot, or RNA blot, is a technique used in molecular biology research to study gene expression by detection of RNA (or isolated mRNA) in a sample.
The northern blot technique was developed in 1977 by James Alwine, David Kemp, and George Stark at Stanford University.
Northern blotting involves the use of electrophoresis to separate RNA samples by size, and detection with a hybridization probe complementary to part of or the entire target sequence.