The chromogenic substrate of X-gal is

Q. The chromogenic substrate of X-gal is:

A.            5-chloro-4-bromo-3indolyl-beta-D-galactoside

B.            5-bromo-4-chloro-3indolyl-beta-D-galactoside

C.            5-chloro-5-bromo-3indolyl-beta-D-galactoside

D.            5-bromo-5-chloro-3indolyl-beta-D-galactoside

Answer: 5-bromo-4-chloro-3indolyl-beta-D-galactoside