This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
[{'content': 'A 2-year-old child, fed on milk diet, presents with persistent diarrhea, acidic stools (pH of stools less than 5.5) on two separate occassions and presence of 1% of reducing substances in the fresh stools. What is the most probable diagnosis: September 2012 \nSelect and explain. \nA. Cystic fibrosis, B. Lactose intolerance, C. Rotavirus induced diarrhoea, D. Intestinal tuberculosis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B i.e. Lactose intolerance', 'role': 'assistant'}]