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Thus , to convert from units of Fahrenheit to units of Celsius , one subtracts 32 " °F ( the offset from the point of reference ) , divides by 9 " °F and multiplies by 5 " °C ( scales by the ratio of units ) , and adds 0 " °C ( the offset from the point of reference ) .
 Fahrenheit, Celsius
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Fahrenheit, Celsius