You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "who is the actor who plays iron man?" whose answer is Downey Jr..
Each document should contain about 30 words, and these documents should contain useful information.

Query: actor who plays iron man
Useful Output:

Doc 1: Robert Downey, Jr. (b. 1965) is an American actor considered to be one of Hollywood's most gifted and versatile performers.
Doc 2: The Marvel Cinematic Universe had more options than just Robert Downey Jr. for Iron Man, even if it's hard to imagine anyone else in the
Doc 3: Robert Downey Jr. (born April 4, 1965) is an American actor best known for playing Iron Man in the Marvel Cinematic Universe.
Doc 4: Now: Iron Man Actor Returning to Avengers Movies. Robert Downey Jr. is known for playing one of Marvel's most beloved heroes. Now, he'll return
Doc 5: Iron Man Actors ; A. Adrian Petriw ; C · Christopher Britton · Crispin Freeman ; D · David Kaye ; E · Eric Loomis ; F · Francis Diakowsky