77460
Tartaric acid in Fehling 's solution binds to copper ( II ) ions , preventing the formation of insoluble hydroxide salts .
 person: Fehling
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: Fehling 
Answer:
 person: Fehling