A 47-year-old with obesity and reflux has H. pylori infection. He smokes and cannot tolerate tetracycline. What alternative first-line regimen is acceptable?AConcomitant non-bismuth quadruple therapy (PPI + amoxicillin + clarithromycin + metronidazole) for 14 days if low macrolide resistanceBClarithromycin triple therapy 7 daysCMetronidazole monotherapyDShort 10-day triple therapy without susceptibility dataENo treatment; lifestyle onlyCheck my answer