Task: Explanation
Input (English): Michele O'Callaghan (September 14, 1963 – December 16, 2011) was a noted American makeup artist. She was personal makeup artist to David Letterman on "The Late Show" for 23 years and made occasional appearances on his show. O'Callaghan also did makeup for Bob Costas and Bryant Gumbel, as well as dozens of sports shows on every TV network. Question: Who was the prime-time host of 12 Olympic Games that Michele O'Callaghan did makeup for? Answer: Robert Quinlan Costas
Output (English):  OCallaghan also did makeup for Bob Costas and Bryant Gumbel, as well as dozens of sports shows on every TV network.