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Its second most important river is the Kelvin whose name was used in creating the title of Baron Kelvin and thereby ended up as the SI unit of temperature .
 Kelvin, Kelvin, SI
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Kelvin, Kelvin, SI