15671
The Calabi–Yau manifolds used in string theory are of interest in pure mathematics , and mirror symmetry allows mathematicians to solve problems in enumerative geometry , a branch of mathematics concerned with counting the numbers of solutions to geometric questions .
 person: Calabi–Yau
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: Calabi–Yau 
Answer:
 person: Calabi–Yau