What is the question to: "The Four Thirds system is a standard created by Olympus and Kodak for digital single-lens reflex camera (DSLR) design and development.<ref name='DPReview.com 2001-02-13'>"? The topic is Four Thirds system.
Ans: "what are four thirds cameras?"

What is the question to: "Due to Madden's insistence that the game be as realistic as possible, the first version of John Madden Football was not released until 1988."? The topic is Madden NFL.
Ans: "when was the first nfl madden game released?"

What is the question to: "The service rapidly gained worldwide popularity, with over 500 million registered users as of 2012, generating over 340 million tweets daily and handling over 1.6 billion search queries per day."? The topic is Twitter.
Ans: "how many users do twitter have?"

What is the question to: "A proxy auto-config (PAC) file defines how web browsers and other user agents can automatically choose the appropriate proxy server (access method) for fetching a given URL ."? The topic is Proxy auto-config.
Ans: "what is a .PAC file?"