Living Under the Proverbial Rock?

On a recent Who Wants To Be A Millionaire, one contestant got a most difficult question. It was so beyond his expertise, he had to reduce the possible answers by using his fifty-fifty. Then, and only then, with a wild guess managed to get it correct.
Which of these California cities lays claim to the title “Capital of Silicon Valley”?
A: San Jose or B: San Francisco
Do you know?
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My guess is San Jose, am I right?
You should be on Who Wants To Be A Millionaire!