As an Over-The-Counter Weight-Loss Drug,how Does Orlistat Work

As an over-the-counter weight-loss drug,how does orlistat work? 

A)  ​It blocks about one-quarter of the fat consumed. 
B)  ​It reduces flatulence. 
C)  ​It curbs diarrhea. 
D)  ​It blocks nearly one-half of the sugars consumed. 
E)  ​It mimics a sense of fullness.