This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastrointestinal tract, Subject name: Pediatrics
[{'content': 'A two year old child presents with persistent diarrhaea acidic stools and presence of one per cent of reducing substance in the fresh stools. What is the most probable diagnosis ? \nSelect and explain. \nA. Cystic fibrosis, B. Lactose intolerance, C. Rotavirus induced diarrhoea, D. Intestinal tuberculosis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: DISACCHARIDASES DEFECIENCY Lactase defeciency diagnosis based on presence of more than .5%of reducing substance in the fresh stools acidic stools abnormal oral sugar tolerance test breath Hydrogen excretion of more than 11ppm following a loading dose of lactose enzyme assay on mucosal biopsies showing low levels of disaccharidases Ref : ESSENTIAL PEDIATRICS,O.P.GHAI,PG NO:274, 7th edition', 'role': 'assistant'}]