A 39-year-old with dyspepsia tests positive for H. pylori (stool antigen). No prior eradication therapy and no local susceptibility data. Best first-line regimen?AOptimized bismuth quadruple therapy for 14 days (PPI bid + bismuth qid + tetracycline qid + metronidazole tid/qid)BStandard clarithromycin triple therapy for 10 daysCLevofloxacin triple therapy for 10 days empiricallyDHigh-dose dual PPI-amoxicillin therapy for 14 days empiricallyERifabutin triple therapy as initial therapyCheck my answer