379598
Rivanicline ( TC-2403 , RJR-2403 , ( E ) - metanicotine ) is a drug which acts as a partial agonist at neural nicotinic acetylcholine receptor s. It is subtype-selective , binding primarily to the α4β2 subtype .
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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:
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