222384
NNK and its metabolite 4 - ( methylnitrosamino ) -1 - ( 3-pyridyl ) -1 - butanol ( NNAL ) are potent systemic lung carcinogens in rats .
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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:  
Answer:
 None