text: <unk>  is an acute or chronic illness caused by infection of the stomach with the bacterium H.<unk> . The infection is mostly without symptoms. Approximately half of worlds population is infected with H.<unk> . The disease is characterized by dyspepsia, gastritis, peptic ulcer disease, adenocarcinoma of stomach or MALT lymphoma.
option_0: Helicobacter pylori infection
option_1: Gastroesophageal reflux disease
option_2: Eosinophilic esophagitis pathophysiology
option_3: Hookworm infection
option_4: Atrophic gastritis
option_5: Intravenous drug use 
option_6: Ethnic group
option_7: Peanut allergy