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Hatching takes place after 10 days of gestation ; the young echidna , called a puggle , born larval and fetus-like , then sucks milk from the pores of the two milk patches ( monotremes have no nipples ) and remains in the pouch for 45 to 55 days , During mating , the heads on one side " shut down " and do not grow in size ; the other two are used to release semen into the female 's two-branched reproductive tract .
 food: milk
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: milk 
Answer:
 food: milk