What was the question for this implicit rationale, and corresponding answer?
The relevant information is: Clearwater is the county seat, and St. Petersburg is the largest city.
The answer: St. Petersburg
The question: Pinellas County is a county located in the state of Florida. As of the 2010 census, the population was 916,542. The county is part of the Tampa -- St. Petersburg -- Clearwater, Florida Metropolitan Statistical Area. Clearwater is the county seat, and St. Petersburg is the largest city.

Answer this question: what is the largest city in pinellas county?