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John Newport Langley and Paul Ehrlich introduced the concept of a receptor that would mediate drug action at the beginning of the 20th century .
 person: John Newport Langley; person: Paul Ehrlich
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: John Newport Langley, Paul Ehrlich 
Answer:
 person: John Newport Langley; person: Paul Ehrlich