Microbiology True about Helicobacter pylori is – A Culture and gram staining of biopsy is the gold standard investigation B Controlled urea breath is negative with massive infection. C Anti urease antibody are produced only by invasive strains D Urease activity provides protective environment to the bacilli. 💡 Explanation True about Helicobacter pylori is - ✓ Correct Answer: D. Urease activity provides protective environment to the bacilli.