Question

The reverse process of pair production is known as:
a)Anti Pair production
b)materialization of matter
c)Annihilation of practical into its antiparticle
d)annihilation of energy

Answer 1

The reverse process is annihilation - process in which particle-antiparticle pair disappears and energy is released in a form of photons (see https://en.wikipedia.org/wiki/Annihilation).

Answer. d.