37741
He rejected Tycho Brahe 's theories on the parallax of comets and claimed that they may be a mere optical illusion .
 person: Tycho Brahe
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Tycho Brahe 
Answer:
 person: Tycho Brahe