Sex factor in bacteria is –                               

Statement $\left(\mathrm{S}\right):$ In ciliates, conjugation restores the vigour and vitality which are lost due to chromosomal imbalance in the macronuclei due to repeated amitotic divisions.

Reason $\left(\mathrm{R}\right):$ Conjugation is temporary union of senile ciliates belonging to same mating types. It often prevents exchange of nuclear material.

Find out the correct combination based on the methods of genetic material exchange which occur in bacteria.