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': 'An infant is crying excessively even after being given good fed. He is passing a large quantity of urine and repeatedly getting dehydrated. Urine examination shows no proteinuria and a specific gravity of 1004. The most likely diagnosis is – \nSelect and explain. \nA. Diabetes mellitus, B. Diabetes insipidus, C. Congenital nephrotic syndrome, D. Protein losing enteropathy', 'role': 'user'}, {'content': 'Answer: B \nExplanation: This child has low urinary specific gravity.\nAmongst the given options only DI causes low urinary specific gravity.', 'role': 'assistant'}]