Given a document, find the main entity about whom the author is writing. Write the full name if mentioned in the text. Note that URLs in the text have been replaced with [Link].
One example is below.
Q: At least Raheem Morris finally has the name of the Bucs' starting quarterback in the back of his mind.
 He wants to make sure he made the decision with his head and not just his heart.
 That's why Morris declined to name his choice between Byron Leftwich and Luke McCown on Friday until after one last consultation with his coaching staff.
 After that  Morris said  he would inform the owners  then his team before making the eagerly awaited announcement. Players were off Friday  so an announcement could come this morning.
 "We'll have a decision here in the near future " Morris said. "I think we've got to go with who we think gives us the best chance to win.
A: Raheem Morris
Rationale: Here the main entity is Raheem  Morris since the main topic of the document is about him starting as quarterback.
Q: The closest  Mark Zuckerberg  has come to directly addressing President Donald Trump in public was when  he  wrote that "progress does not move in a straight line" the day after the election in November.
Since then   Zuckerberg  has embarked on  his  own tour of the U.S. that's been compared to a presidential campaign and sparked rumors that the Facebook CEO is considering a 2020 run.
While  Zuckerberg  has been shy to publicly address Trump   he  has in fact spoken with the president multiple times by phone since the election  Business Insider has learned.  Zuckerberg  revealed that  he 's talked with Trump during a surprise dinner with the Moore family in Newton  Ohio two weeks ago.
Exactly what  Zuckerberg  and Trump discussed is unclear —  Zuckerberg  didn't say during  his  dinner with the Ohio family and  his  spokesperson declined to comment. But the discussions show that the Facebook billionaire has held a dialogue with Trump even as  he  publicly opposes policies like Trump's first executive order on immigration. The White House didn't return a request for comment.
 Zuckerberg  and Facebook's relationship with Trump is complicated. Facebook was widely criticized in the wake of the election for its role in the proliferation of so-called fake news  which many believed help Trump win the election.  Zuckerberg  has called that notion "pretty crazy " but Facebook has made significant strides to eradicate fake news stories from its platform.
When Trump called together the tech industry's top leaders for a meeting of the minds in December  Facebook COO Sheryl Sandberg went instead of  Zuckerberg . Before Trump was elected   Zuckerberg  had come to the defense of the Facebook board member and Trump advisor who organized that same meeting with tech leaders  Peter Thiel.
"We care deeply about diversity "  Zuckerberg  wrote in an internal memo to Facebook employees that was leaked in October. "That's easy to say when it means standing up for ideas you agree with. It's a lot harder when it means standing up for the rights of people with different viewpoints to say what they care about. That's even more important."
A:
Mark Zuckerberg