Question: The circuit that held the Rothmans 50,000 hosted how many stagings of the British Grand Prix?
Sentence (from "2017 British Grand Prix"): The 2017 British Grand Prix (formally known as the 2017 Formula 1 Rolex British Grand Prix) was a Formula One motor race that took place on 16 July 2017 at the Silverstone Circuit in Silverstone, United Kingdom.
Relevant evidence: No