6830
HVAC contractors , firemen and engineers use combustion analyzers to test the efficiency of a burner during the combustion process .
 organization: HVAC
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: HVAC 
Answer:
 organization: HVAC