18591
RATIONALE : Growing evidence supports a role for the central histaminergic system to have a modulatory influence on drug addiction in general and alcohol - use disorders in particular through histamine H3 receptors ( H3R ) .
 Chemical: alcohol; Chemical: histamine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: alcohol; Chemical: histamine