Detailed Instructions: 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.
See one example below:
Problem: 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.
Solution: who has the maximum number of followers on instagram
Explanation: 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.

Problem: Iron Man 2 is a 2010 American superhero film based on the Marvel Comics character Iron Man, produced by Marvel Studios and distributed by Paramount Pictures. It is the sequel to 2008's Iron Man, and is the third film in the Marvel Cinematic Universe (MCU). Directed by Jon Favreau and written by Justin Theroux, the film stars Robert Downey Jr. as Tony Stark / Iron Man, alongside Gwyneth Paltrow, Don Cheadle, Scarlett Johansson, Sam Rockwell, Mickey Rourke, and Samuel L. Jackson. Six months after the events of Iron Man, Tony Stark is resisting calls by the United States government to hand over the Iron Man technology while also combating his declining health from the arc reactor in his chest. Meanwhile, rogue Russian scientist Ivan Vanko has developed the same technology and built weapons of his own in order to pursue a vendetta against the Stark family, in the process joining forces with Stark's business rival, Justin Hammer.
Solution:
who is the enemy in iron man 2