Q: In this task, you are given a sentence. You are expected to write the name of the organism substances in the body mentioned in the input. Although there might be several correct answers, you need to write one of them.
 Seven day point - prevalence abstinence will be determined by combining self - reported tobacco use over the prior seven days and urine cotinine assays ( below 200 ng / ml versus 200 or above ) .
A:
urine