<prompt> A patient presents with zo11inger-Ellison syndrome due to gastrinoma. He has two bleeding ulcers and diarrhoea. A drug that irreversibly inhibits the HK ATPase in gastric parietal cells is:CimetidineCisaprideGlycopyrrolateOmeprazole  <response>: that react covalently with SH groups of the HKATP ase enzyme and inactivate it irreversibly ESSENTIALS OF MEDICAL PHARMACOLOGY SEVENTH EDITION KD TRIPATHI PG NO 651 