Given the question: Information:  - Giacomo Agostini (born 16 June 1942) is an Italian multi-time world champion Grand Prix motorcycle road racer. Nicknamed Ago, with an absolute record of 122 Grand Prix wins and 15 World Championships titles. Of these, 68 wins and 8 titles came in the 500cc class, the rest in the 350cc class.  - The 24 Hours of Daytona, currently known as the Rolex 24 At Daytona for sponsorship reasons, is a 24-hour sports car endurance race held annually at Daytona International Speedway in Daytona Beach, Florida. It is run on a combined road course, utilizing portions of the NASCAR tri-oval and an infield road course. Since its inception, it has been held the last weekend of January or first weekend of February, part of Speedweeks, and it is the first major automobile race of the year in the United States. It is also the first race of the season for the WeatherTech SportsCar Championship.  - A motorcycle (also called a motorbike, bike, or cycle) is a two- or three-wheeled motor vehicle. Motorcycle design varies greatly to suit a range of different purposes: long distance travel, commuting, cruising, sport including racing, and off-road riding. Motorcycling is riding a motorcycle and related social activity such as joining a motorcycle club and attending motorcycle rallies.  - In North America, road racing is motor racing held on a paved closed circuit with both left and right turns. Road racing is therefore distinct from both off-road racing and oval track racing; the latter is common in North America and involves turning in only one direction (usually left, counter-clockwise). Road racing may be on purpose-built race tracks (called road courses) or on temporary circuits, such as closed-off airport runways and public roads, typically street circuits. A "roval" is a road course incorporating parts of an oval track and its infield, such as is used for the 24 Hours of Daytona at Daytona International Speedway.  - Valentino Rossi (born 16 February 1979) is an Italian professional motorcycle racer and multiple MotoGP World Champion. He is considered to be the greatest and one of the most successful , with nine Grand Prix World Championships to his name  seven of which are in the premier class.  - Michael `` Mick '' Sydney Doohan , AM ( born 4 June 1965 ) is an Australian former Grand Prix motorcycle road racing World Champion , who won five consecutive 500 cc World Championships . Only Giacomo Agostini with eight ( seven consecutive ) and Valentino Rossi with seven ( five consecutive ) have won more premier class titles .  - According to the International Civil Aviation Organization (ICAO), a runway is a "defined rectangular area on a land aerodrome prepared for the landing and takeoff of aircraft". Runways may be a man-made surface (often asphalt, concrete, or a mixture of both) or a natural surface (grass, dirt, gravel, ice, or salt).    After reading the paragraphs above, we are interested in knowing the entity with which 'mick doohan' exhibits the relationship of 'occupation'. Find the answer from the choices below.  Choices: - aviation  - major  - motorcycle racer  - travel
The answer is:
motorcycle racer