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Operated on by Dr. Alfred Blalock and his assistant Vivien Thomas , Anna survived the first pulmonary bypass after having been operated on twice .
 person: Alfred Blalock; person: Vivien Thomas; person: Anna
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Alfred Blalock, Vivien Thomas, Anna 
Answer:
 person: Alfred Blalock; person: Vivien Thomas; person: Anna