The pronoun used in the sentence is relative pronoun, in the given sentence the relative pronoun is What.
Complex sentences are formed by using relative pronouns. The relative pronouns who, whom, whose, where, when, why, that, and how are a few examples. Where - A place is referred to. Who - Denotes an individual (the noun, pronoun, or subject that performs the action).
The winning cyclist put in a lot of training. My new pants from yesterday are already soiled. Whoever the committee chooses as the four team leaders, they will be present at tomorrow's meeting. We eat spaghetti at least twice a week, and it's one of our favorite dishes.
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