Read the following premise and answer if the hypothesis is true.
The USAC Road Racing Championship was a sports car racing series in the United States held from 1958 until 1962. The series was organized by the United States Auto Club as a fully professional alternative to the Sports Car Club of America's SCCA National Sports Car Championship.
Hypothesis: The winner of the 1958  USAC Road Racing Championship retired after that race.. Is the answer "Yes", "No", or "It's impossible to say"? Respond with only the answer and no additional text.
It's impossible to say
It's impossible to say. The winner of the 1958 USAC Road Racing Championship is not identified in the provided information.