81843
When the surrounding gas and dust envelope disperses and accretion process stops , the star is considered a pre-main-sequence star ( PMS star ) .
 pre-main-sequence star
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:
 pre-main-sequence star