Jim Mattis
Table:
Jim Mattis

In office
November 9, 2007 – August 11, 2010
President

George W. Bush
Barack Obama

Preceded by	Lance L. Smith
Succeeded by	Raymond T. Odierno

Looking at the table, decide if the statement is entailed, neutral, or refuted by the data. Conclude with JSON {"answer": "YOUR ANSWER"} — nothing else.

Assertion: Jim Mattis was head of the Joint Chiefs of Staff.

answer: neutral