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Exposure of human oral mucosa to lead ( Pb ) and benzo [ a ] pyrene ( BaP ) by inhalation and ingestion can lead to pathological conditions via apoptosis and oxidative and nitrosative stress .
 Chemical: Pb; Chemical: benzo [ a ] pyrene; Chemical: BaP
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: Pb; Chemical: benzo [ a ] pyrene; Chemical: BaP