47871
Some specialized yeasts , e.g. , " Candida tropicale " , " Pichia " sp. , " Rhodotorula " sp. , can use alkanes as a source of carbon or energy .
 Pichia, Rhodotorula
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Pichia, Rhodotorula