90421
She used methods such as the pie chart , which had first been developed by William Playfair in 1801 .
 person: William Playfair
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: William Playfair 
Answer:
 person: William Playfair