<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 49-year-old male complains of abdominal discomfort that worsens following meals. A gastric biopsy reveals a 2 cm gastric ulcer, and immunohistochemical staining demonstrates the presence of a rod-shaped bacterium in the gastric mucosa. Which of the following is used by the infiltrating pathogen to neutralize gastric acidity?? A: Flagella, B: Mucinase, C: Bismuth, D: Urease, E: LT toxin,  <response>: This is a question about the pathogenesis of a gastric ulcer caused by a rod-shaped bacterium. The key finding is the presence of the bacterium in the gastric mucosa on biopsy. This suggests infection with Helicobacter pylori, which is known to cause gastric ulcers. H. pylori uses the enzyme urease to neutralize gastric acidity by generating ammonia. Therefore, the correct answer should be urease.D: Urease 