60542
On the western border are two spiral galaxies and the Wolf–Rayet planetary nebula IC 4406 , containing some of the hottest stars in existence .
 astronomical object: spiral galaxies; astronomical object: Wolf–Rayet; astronomical object: planetary nebula; astronomical object: IC 4406
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: spiral galaxies, Wolf–Rayet, planetary nebula, IC 4406 
Answer:
 astronomical object: spiral galaxies; astronomical object: Wolf–Rayet; astronomical object: planetary nebula; astronomical object: IC 4406