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Like other hammerheads , the smooth hammerhead is viviparous : once the young exhaust their supply of yolk , the empty yolk sac is converted into a placental connection through which the mother delivers nourishment .
 food: yolk
Please list all entity words in the text that fit the category.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} 
Answer:
 food: yolk