12255
Thus , single , short - term exposure to Pb or BaP increases the levels of apoptosis markers and markers of oxidative and nitrosative stress .
 Chemical: Pb; 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: BaP