Q: In this task, you're given a statement, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.
Context: Roy Halladay pitched the 20th perfect game in MLB history Link Information: The Philadelphia PhilliesFlorida Marlins game began at 7:13p.m. on May 29, 2010, to a crowd of 25,086 at Sun Life Stadium Question: Who owned Sun Life Stadium the day Roy Halladay pitched the 20th perfect game in MLB history?
A:
Answer: Stephen M. Ross