‘Somebody must have taken my bicycle.’ What type of pronoun is the word "somebody"?

The correct answer is a) ‘Indefinite’. The words that are used in place of a noun are pronouns. The name of a person, place, animal, or item can be the noun that is replaced. According to English grammar, a pronoun cannot be used until and unless a noun has been mentioned or used beforehand. The pronouns that stand for or are implied for some nouns are called indefinite pronouns. In the given sentence, ‘Somebody must have taken my bicycle’, the pronoun ‘somebody’ is understood to be related to some noun.