Golden rice is a variety of rice grown along the Yellow River in China.

Assertion $\left(\mathrm{A}\right):$ Bt toxin exists as inactive prototoxin but once an insect ingests the inactive toxin, it is converted into an active form of toxin.

Reason $\left(\mathrm{R}\right):$  Protoxin gets activated in insect gut due to the acidic $\mathrm{pH}$ in the gut, which solubilises the protein crystals.

The correct answer is:

Assertion (A) : Transgenic Golden Rice is rich in Vitamin A and prevents blindness.

Reason (R) : It is obtained from "Taiwan"

The correct combination pair of given strategies in the area of health care developed by the rDNA technological processes.