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However , the work of Stephen Wurm ( 1982 ) and Malcolm Ross ( 2005 ) has provided considerable evidence for his once-radical idea that these languages form a single genetic unit .
 person: Stephen Wurm; person: Malcolm Ross
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: Stephen Wurm, Malcolm Ross 
Answer:
 person: Stephen Wurm; person: Malcolm Ross