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Adopting Thomas Robert Malthus 's population theory , they saw poor urban conditions as inevitable , believed population growth would outstrip food production and thus regarded that consequence desirable because starvation would help limit population growth .
 person: Thomas Robert Malthus
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: Thomas Robert Malthus 
Answer:
 person: Thomas Robert Malthus