Find the incorrect 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 infertility
(c) Bt toxin is biodegradable insecticide obtained from Bacillus
(d) Trichoderma sp is a bio control agent for fungal diseases of plants
