In 'Completing The Analogous Pair', two words are given. These words are related to each other in some way. Another word is also given. The candidate is required to find out the relationship between the first two words and choose the word from the given alternatives, which bears the same relationship to the third word, as the first two bear.
Assertion (A) : Nuclear fusion is used to generate eletricity.
Reason (R) : Nuclear power is not used because it cannot be controlled.
A controlled nuclear fission reaction is used to generate electricity.
Nowadays, controlled nucear power finds many important applications.