Question: Matthias Mann, is a scientist in the area of mass spectrometry and proteomics, he received his Ph.D. in 1988 at Yale University where he worked in the group of who, which American research professor of analytical chemistry who was awarded a share of the Nobel Prize in Chemistry in 2002?
{'answer': 'John Fenn', 'supporting_facts': [['Matthias Mann', 2], ['John Fenn (chemist)', 0]]}