| 1 | A | B | C | D | E | F |
| --- | --- | --- | --- | --- | --- | --- |
| 2 | List of Grand Prix motorcycle racing World Champions by year - List |  |  |  |  |  |
| 3 | Year | 500cc | 350cc | 250cc | 125cc | Sidecar |
| 4 | 1949 | United Kingdom Leslie Graham (AJS) | United Kingdom Freddie Frith (Velocette) | Italy Bruno Ruffo (Moto Guzzi) | Italy Nello Pagani (Mondial) | United Kingdom Eric Oliver United Kingdom Denis Jenkinson (Norton) |
| 5 | 1950 | Italy Umberto Masetti (Gilera) | United Kingdom Bob Foster (Velocette) | Italy Dario Ambrosini (Benelli) | Italy Bruno Ruffo (Mondial) | United Kingdom Eric Oliver Italy Lorenzo Dobelli (Norton) |
| 6 | 1951 | United Kingdom Geoff Duke (Norton) | United Kingdom Geoff Duke (Norton) | Italy Bruno Ruffo (Moto Guzzi) | Italy Carlo Ubbiali (Mondial) | United Kingdom Eric Oliver Italy Lorenzo Dobelli (Norton) |
| 7 | 1952 | Italy Umberto Masetti (Gilera) | United Kingdom Geoff Duke (Norton) | Italy Enrico Lorenzetti (Moto Guzzi) | United Kingdom Cecil Sandford (MV Agusta) | United Kingdom Cyril Smith United Kingdom Bob Clements United Kingdom Les Nutt (Norton) |
| 8 | 1953 | United Kingdom Geoff Duke (Gilera) | United Kingdom Fergus Anderson (Moto Guzzi) | West Germany Werner Haas (NSU) | West Germany Werner Haas (NSU) | United Kingdom Eric Oliver United Kingdom Stanley Dibben (Norton) |
| 9 | 1954 | United Kingdom Geoff Duke (Gilera) | United Kingdom Fergus Anderson (Moto Guzzi) | West Germany Werner Haas (NSU) | Austria Rupert Hollaus (NSU) | West Germany Wilhelm Noll West Germany Fritz Cron (BMW) |
| 10 | 1955 | United Kingdom Geoff Duke (Gilera) | United Kingdom Bill Lomas (Moto Guzzi) | West Germany Hermann Paul Müller (NSU) | Italy Carlo Ubbiali (MV Agusta) | West Germany Willi Faust West Germany Karl Remmert (BMW) |
| 11 | 1956 | United Kingdom John Surtees (MV Agusta) | United Kingdom Bill Lomas (Moto Guzzi) | Italy Carlo Ubbiali (MV Agusta) | Italy Carlo Ubbiali (MV Agusta) | West Germany Wilhelm Noll West Germany Fritz Cron (BMW) |
| 12 | 1957 | Italy Libero Liberati (Gilera) | Australia Keith Campbell (Moto Guzzi) | United Kingdom Cecil Sandford (Mondial) | Italy Tarquinio Provini (Mondial) | West Germany Fritz Hillebrand West Germany Manfred Grunwahl (BMW) |
| 13 | 1958 | United Kingdom John Surtees (MV Agusta) | United Kingdom John Surtees (MV Agusta) | Italy Tarquinio Provini (MV Agusta) | Italy Carlo Ubbiali (MV Agusta) | West Germany Walter Schneider West Germany Hans Strauß (BMW) |
| 14 | 1959 | United Kingdom John Surtees (MV Agusta) | United Kingdom John Surtees (MV Agusta) | Italy Carlo Ubbiali (MV Agusta) | Italy Carlo Ubbiali (MV Agusta) | West Germany Walter Schneider West Germany Hans Strauß (BMW) |
| 15 | 1960 | United Kingdom John Surtees (MV Agusta) | United Kingdom John Surtees (MV Agusta) | Italy Carlo Ubbiali (MV Agusta) | Italy Carlo Ubbiali (MV Agusta) | West Germany Helmut Fath West Germany Alfred Wohlgemuth (BMW) |
| 16 | 1961 | Federation of Rhodesia and Nyasaland Gary Hocking (MV Agusta) | Federation of Rhodesia and Nyasaland Gary Hocking (MV Agusta) | United Kingdom Mike Hailwood (Honda) | Australia Tom Phillis (Honda) | West Germany Max Deubel West Germany Emil Hörner (BMW) |

Question: How many Grand Prix World Championships has Bruno Ruffo won?
Answer: Bruno Ruffo won three Grand Prix World Championships.