In this task, you are given a sentence. You are expected to recognize the name of any form of chemical substances. Although there might be several correct answers, you need to write one of them.

Q: Estradiol replacement enhances cocaine-stimulated locomotion in female C57BL/6 mice through estrogen receptor alpha.

A: estrogen
****
Q: Relative expression of cholesterol transport-related proteins and inflammation markers through the induction of 7-ketosterol-mediated stress in Caco-2 cells.

A: cholesterol
****
Q: Use of tranexamic acid for an effective blood conservation strategy after total knee arthroplasty.

A:
tranexamic acid
****