The city hosted the 2010 Commonwealth Games and annually hosts Delhi Half Marathon foot-race. The city has previously hosted the 1951 Asian Games and the 1982 Asian Games. New Delhi was interested  in bidding for the 2019 Asian Games but was turned down by the government on 2 August 2010 amid allegations of corruption in 2010 Commonwealth Games .
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): New Delhi is the annual host of what foot-race?
Delhi Half Marathon