Question: Alexis Sánchez specialized in the event that is included in the athletics program at what premier event?
Related documents: [0]  [DOC] The 110 metres hurdles, or 110-meter hurdles, is a hurdling track and field event for men. It is included in the athletics programme at the Summer Olympic Games. The female counterpart is the 100 metres hurdles. As part of a racing event, ten hurdles of 1.067 metres (3.5 ft or 42 inches) in height are evenly spaced along a straight course of 110 metres. They are positioned so that they will fall over if bumped into by the runner. Fallen hurdles do not carry a fixed time penalty for the runners, but they have a significant pull-over weight which slows down the run. Like the 100 metres sprint, the 110 metres hurdles begins in the starting blocks. [END] 
[1]  [DOC] Alexis Sánchez González (born 13 April 1971) is a retired Spanish athlete who specialised in the 110 metres hurdles and 400 metres hurdles. Before Spain he represented his native Cuba, competing at the 1991 World Championships where he reached the semifinals. He was also the 110 metres hurdles World Junior Championships silver medalist in 1990. [END] 
Answer: 
Summer Olympic Games
Summer Olympic Games