In this task you will be given an answer to a question. You need to generate a question. The answer given should be a correct answer for the generated question.
One example is below.
Q: This list contains the top 25 accounts with the most followers on the social photo-sharing platform Instagram. As of May 2018, the most followed user is Instagram's own account, with over 235 million followers. Selena Gomez is the most followed individual, with over 137 million followers. Ten accounts have exceeded 100 million followers on the site.
A: who has the maximum number of followers on instagram
Rationale: The answer is talking about the Instagram accounts that have the most followers. The question asking about the maximum number of followers. So this is a good example.
Q: Djokovic started the year by playing the Hopman Cup with fellow Serbian world No. 3 Jelena Janković. While he won all his round-robin matches, the team lost 1 -- 2 in the final to the second-seeded American team of Serena Williams and Mardy Fish. At the Australian Open, Djokovic reached his second consecutive Grand Slam final without dropping a set, including a victory over two-time defending champion Federer in the semi-finals. By reaching the semi-finals, Djokovic became the youngest player to have reached the semi-finals in all four Grand Slam events. In the final, Djokovic defeated unseeded Frenchman Jo-Wilfried Tsonga in four sets to earn his first Grand Slam singles title. This marked the first time since the 2005 Australian Open that a Grand Slam singles title was not won by Federer or Nadal.
A:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
when did djokovic win his first grand slam