81254
Blazars were highly represented among these early quasars , and the first redshift was found for 3 C 273 , a highly variable quasar which is also a blazar .
 astronomical object: 3 C 273
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: 3 C 273 
Answer:
 astronomical object: 3 C 273