5718
In contrast to naphthenic acids exposures , as similar dose of benzo [ a ] pyrene caused a significant decrease in B - and T - lymphocyte absolute counts in blood and relative B - lymphocyte counts in spleen .
 Chemical: naphthenic acids; Chemical: benzo [ a ] pyrene
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: naphthenic acids, benzo [ a ] pyrene 
Answer:
 Chemical: naphthenic acids; Chemical: benzo [ a ] pyrene