44050
" Nepenthes gracilis " was formally described by Pieter Willem Korthals in his 1839 monograph , " Over het geslacht " Nepenthes " " .
 person: Pieter Willem Korthals
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: Pieter Willem Korthals 
Answer:
 person: Pieter Willem Korthals