sentences:  Mehmet Oz
  
  Mehmet Cengiz Öz (; born June 11, 1960), known professionally as Dr. Oz, is a Turkish-American television personality, cardiothoracic surgeon, Columbia University professor, pseudoscience promoter, journalist, and author.In 2003, Oprah Winfrey was the first guest on the Discovery Channel series "Second Opinion with Dr. Oz", and, since 2004, Oz became a regular guest on "The Oprah Winfrey Show", making more than sixty appearances.