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.

[Q]:  Furthermore , significant increases in fecal cholesterol , neutral sterols and bile acid excretion along with an increase in hepatic HMG - CoA reductase activity and bile acid production were observed in these animals .
[A]: fecal


[Q]:  Intra - operative monitoring of partial pressure of tissue oxygen ( PtiO2 ) is a very sensitive method of detecting the decrease of oxygen for cell utilization , due to decreased blood flow , during temporary clipping and after definitive clipping , in middle cerebral artery incidental unruptured aneurysm surgery .
[A]: blood


[Q]:  Data were collected by means of a questionnaire from a convenience sample of 509 predominantly well - educated , high - income , married women in the northeastern United States during the last trimester of pregnancy .
[A]:
sample