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According to philosopher Steven Crowell , defining existentialism has been relatively difficult , and he argues that it is better understood as a general approach used to reject certain systematic philosophies rather than as a systematic philosophy itself .
 person: Steven Crowell
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
 Entities: Steven Crowell 
Answer:
 person: Steven Crowell