3801
This last finding may be related to time of testing and / or endogenous serum binding of rifampin which could have inhibited mitogen activity for the lymphocyte .
 Chemical: rifampin
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: rifampin