Nobody but I safe from pollution.
Term:
An indefinite pronoun is a pronoun that doesn't specifically identify what it is referring to. For example, the word someone is an indefinite thing.
An indefinite pronoun does not refer to any specific person, thing or amount. It is vague and "not definite". Some typical indefinite pronouns are: all, another, any, anybody/anyone, anything, each, everybody/everyone, everything, few, many, nobody, none, one, several, some, somebody/someone.
Types of indefinite pronouns fit two categories: those that are made up of two morphemes and are called compound pronouns, such as somebody, and those that are followed by the word of, called of-pronouns, such as all or many.
So the Nobody is the correct answer of the given sentence problem.
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