392635
In 1865 , William Stanley Jevons observed that England 's consumption of coal increased considerably after James Watt introduced his improvements to the steam engine .
 person: William Stanley Jevons; person: James Watt
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 Stanley Jevons, James Watt 
Answer:
 person: William Stanley Jevons; person: James Watt