Instructions: 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.
Input:  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 .
Output:
fecal