All are tests used to assess the treatment response in helicobacter pylori infection, EXCEPT:: (A) Urea breath test, the, (B) Stool antigen test, (C) Biopsy-based tests, (D) Serology
Answer is D. The urea breath test, the stool antigen test, and biopsy-based tests can all be used to assess the success of treatment Ref:Harrisons Principles of Internal Medicine, 18th Edition, Page 1221