Correct option is (d) H2 and proton pump
Explanation: There are four different kinds of antiulcer agent. There are a reduction of gastric acid secretion, neutralization of gastric acid by antacids, ulcer protectives and anti H, pyloric drugs. Under reduction of gastric acid secretion H2 antihistamines, Proton pump inhibitors, anticholinergics, prostaglandin analogues are there.