Urea breath test is done in:: (A) Ketoacidosis, (B) H. pylori infection, (C) Kidney disease, (D) Liver disease
Answer is B. The urea breath test is a rapid diagnostic procedure used to identify infections by Helicobacter pylori, a spiral bacterium implicated in gastritis, gastric ulcer, and peptic ulcer disease. 
It is based upon the ability of H. pylori to convert urea to ammonia and carbon dioxide.