qnli question: Which successful World Touring Car Championship driver was produced in Switzerland despite the ban on motorsport events? sentence: During this period, the country still produced successful racing drivers such as Clay Regazzoni, Sebastian Buemi, Jo Siffert, Dominique Aegerter, successful World Touring Car Championship driver Alain Menu, 2014 24 Hours of Le Mans winner Marcel Fässler and 2015 24 Hours Nürburgring winner Nico Müller.