Given a context passage, generate a question from the passage such that its answer is shortest continous span from the passage.
Q: The Deepwater Horizon oil spill (also referred to as the BP oil spill, the BP oil disaster, the Gulf of Mexico oil spill, and the Macondo blowout) began on 20 April 2010 in the Gulf of Mexico on the BP-operated Macondo Prospect.
A:
What year did Deepwater Horizon oil spill start?