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In contrast , a fetus that develops alone in the womb ( the much more common case , in humans ) is called a " singleton " , and the general term for one offspring of a multiple birth is a " multiple " .
 animal: fetus
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: fetus 
Answer:
 animal: fetus