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Many scientists observed that enzymatic activity was associated with proteins , but others ( such as Nobel laureate Richard Willstätter ) argued that proteins were merely carriers for the true enzymes and that proteins " per se " were incapable of catalysis .
 person: Richard Willstätter
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: Richard Willstätter 
Answer:
 person: Richard Willstätter