49001
He compiled a list of them , in collaboration with his friend and assistant Pierre Méchain ( who may have found at least 20 of the objects ) , to avoid wasting time sorting them out from the comets they were looking for .
 person: Pierre Méchain
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: Pierre Méchain 
Answer:
 person: Pierre Méchain