Please select the eligibility criteria that correspond to the clinical trial below.
Title: Effect of Helicobacter Pylori Eradication on the New Tumor Development After Endoscopic Resection of Gastric Tumors
Brief Summary: The purpose of this study is to determine whether Helicobacter pylori eradication could reduce the new tumor development after endoscopic resection of gastric tumor.


Options:
A: Inclusion Criteria:

* H pylori infected patients with gastric low-grade dysplasia, high-grade dysplasia, and early gastric cancer
* Gastric tumor is completely removed through endoscopic resection.

Exclusion Criteria:

* Patients underwent gastrectomy before enrollment
* patients underwent endoscopic resection before enrollment
* Previous history of eradication for H. pylori
* Pregnancy
* Aged \<20 yr old or aged \>75 yr old
* Patients underwent additional gastrectomy due to incomplete endoscopic resection
B: Inclusion Criteria:

* Aged 29-77 years; have lived in Pasto, Colombia for at least 5 years and plan to remain in Pasto for ≥5 more years;
* Currently have Helicobacter pylori infection;
* Willing to refrain from alcohol consumption for 2 weeks;
* Have never taken a therapy to eradicate Helicobacter pylori;
* Have not taken antibiotics, bismuth compounds, proton-pump inhibitors, H2-receptor antagonists, or antacids within 30 days of the trial;
* Are not pregnant, and have little or no risk of pregnancy.

Exclusion Criteria:

* History of kidney, liver, heart, or mental disease;
* Frequent alcohol consumption;
* Allergic to clarithromycin, amoxicillin, penicillin, omeprazole or metronidazole;
* Currently taking drugs which may interact with any of the trial medications.
C: Inclusion Criteria:

* Helicobacter pylori infection subjects

Exclusion Criteria:

* Prior gastrectomy; pregnant women
D: Inclusion Criteria:

* Men and women aged 40-64 at the time of signing the consent form
* Willingness to get involved in the study irrespective in which of the study arms (after detailed information on the potential benefits and risks that this study may confer)
* The person has signed a consent form (including the acceptance of transporting the samples over the borders, as appropriate)
* To be in good health, as determined by a physical examination and history performed by a study physician at enrolment

Exclusion Criteria:

* Personal history of gastric cancer (prevalent gastric cancer cases will not be revealed at the time of inclusion, and therefore will be included)
* Gastric resections due to benign disease (ulcer suturing and vagotomy are accepted)
* H. pylori eradication therapy within 12 months prior to inclusion (irrespective of the treatment result)
* Presence of alarm symptoms for digestive or any other diseases (detailed in the questionnaire or during the physician evaluation)
* Pathological findings at physical investigation suggestive for a serious organic disease (physician evaluation)
* Serious co-morbid condition with life expectancy less than 5 years (physician evaluation)
* Factors otherwise limiting the participation according to the protocol conditions (problems of mobility, etc.)
* Serious psychological conditions/psychiatric disease limiting the possibilities to understand the requirements for diagnostic and/or medical interventions (physician evaluation)
* Low expectations on the compliance for the diagnostic work-up or treatment (physician evaluation)
* Expected loss for the follow-up (e.g. lack of communication possibilities and data entry in the registries, expected travel abroad, etc.) (physician evaluation)
* Signed consent form is not available

Answer: A