Generate a question which can yield the answer mentioned in the input. Generated question must be answered by the answer provided in input, without using any extra knowledge.
Q: Context : The Gaisal train disaster occurred on 2 August 1999, when two trains carrying 2,500 people collided at the remote station of Gaisal, 310 miles from the city of Gauhati in Assam.
Answer : 2 August 1999
A:
What was the date of Gaisal train disaster?