You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: GEORGE WASHINGTON 
Clue: In 1798 George wrote to John Greenwood, a man in this profession, "I am...ready to pay what ever you may charge me"
dentist

Category: U.S. GOVERNMENT 
Clue: This group that first met in 1942 didn't get a permanent chairman until 1949
the joint chiefs of staff

Category: THE 16th CENTURY 
Clue: Held in 1579, the first Christian service in California was performed by the chaplain traveling with this English captain

sir francis drake