General Knowledge Quiz for Friday, 25 April 2014

A new general knowledge quiz is available every day. Try today's quiz or work through our archive of daily and themed quizzes.

Question 1: Which of these is an American investigative journalist and author of several best-selling unauthorised "poison pen" biographies of celebrities and politicians, including Jacqueline Onassis, Elizabeth Taylor, Frank Sinatra, Nancy Reagan, the British Royal Family and "the Bush Dynasty"?