70861
It was formally described in 1744 by the mathematician Leonhard Euler .
 person: Leonhard Euler
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: Leonhard Euler 
Answer:
 person: Leonhard Euler