GFP is one of a marker which is used for screening libraries in hosts other than E. coli. Choose the incorrect statement for GFP.

• A. It stands for Green Fluorescent Protein
• B. It is obtained from a bio-luminescent jellyfish and produces a protein aequorin which emits blue light
• C. The blue light is produced because of binding of sodium ions
• D. The absorbed blue light produces green light which can be detected further