Question: Sara Josephine Baker was an American physician notable for making contributions to public health, known for twice tracking down which infamous index case better known as Typhoid Mary,  the first person in the United States identified as an asymptomatic carrier of the pathogen associated with typhoid fever, her name?
{'answer': 'Mary Mallon', 'supporting_facts': [['Sara Josephine Baker', 3], ['Mary Mallon', 0]]}