This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Medicine
Hydrogen breath test is/ae used for 
Select and explain. 
A. Lactose intolerance, B. GERD, C. H.Pylori, D. Irritable bowel syndrome
A: Lactose intolerance
Answer: A: Lactose intolerance 
Explanation: <p>Davidson&;s principles and practice of medicine 22nd edition. *The lactose hydrogen breath test is an useful non invasive confirmatory investigation. <p>