Find the incorrrect statement

• A. Gene therapy is a genetic engineering technique used to treat disease at molecular level by replacing defective genes with normal genes.
• B. Calcitonin is a medically useful recombinant product in the treatment of intetility
• C. Bt toxin is a Biodegradable insecticide obtained from bacillis thuringiensis
• D. Trichoderma sp. is a biocontrol agent for fungal diseases of plants