Which legendary Pyrenean mountain pass, one of the most frequently featured climbs in Tour de France history, is famed as one of the race's toughest tests?

• A The Col du Tourmalet ✓
• B Alpe d'Huez
• C The Col du Galibier
• D Mont Ventoux

The Col du Tourmalet has featured in the Tour de France more times than any other mountain pass.