<prompt> Answer this question truthfullyWhat is quadruple therapy, and what are the four components of this treatment regimen?  <response>: <reason> Quadruple therapy is a treatment regimen that typically consists of a proton pump inhibitor PPI or an H2-receptor antagonist, bismuth, tetracycline, and metronidazole. This combination of medications is often used to treat Helicobacter pylori infections in the stomach. 