12190
Dock leaves are an excellent source of both vitamin A and vitamin C , as well as a source of iron and potassium .
 location: C
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: C 
Answer:
 location: C