Bt toxin is produced by :

Consider the following statements. A. Bt toxin is produced by a bacterium called Bacillus thuringiensis. B. The Bt toxin is coded by a gene named cry. C. Bt inactive toxin is converted into an active form of toxin due to the acidic pH of the insect gut. D. The Bt proteins encoded by the genes cryIAc and cryIIAb control the corn borer. Of the above statements:

Bt toxin is produced by a bacterium called Bacillus thuringiensis ( Bt for short). These Bt toxin crystals contain by a gene named cry which has many variants. Which one from the following produces a toxin that controls corn borer ?