X-ray is the reverse process of:

Explanation

Option A) The pair production process occurs when a high-energy photon interacts with the electromagnetic field of a nucleus, resulting in the creation of an electron-positron pair. This process is the opposite of annihilation, where a particle and its antiparticle combine to produce a photon. Option B) The Compton effect occurs when a high-energy photon collides with an electron, transferring some of its energy to the electron and causing it to scatter in a different direction. The scattered photon has a lower energy and longer wavelength than the original photon. Option C) The phenomenon of X-ray production is considered to be the inverse of the photoelectric effect. The photoelectric effect is when a high-energy photon hits a metal surface, and an electron is emitted. In the inverse process, photons are emitted when electrons hit a metal. This happens in X-ray production. Therefore, neither option A nor B is the reverse process of X-ray, making option D incorrect.