46533
For calcite , if we interchange the equatorial and polar radii of Huygens 's oblate spheroid while preserving the polar direction , we obtain a " prolate " spheroid touching the sphere at the equator .
 person: Huygens
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: Huygens 
Answer:
 person: Huygens