19789
Vietnam , and Afghanistan blood serum levels have been recorded to be below one part per billion .
 location: Vietnam; location: Afghanistan
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: Vietnam, Afghanistan 
Answer:
 location: Vietnam; location: Afghanistan