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
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 – 
Select and explain. 
A. Diabetes mellitus, B. Diabetes insipidus, C. Congenital nephrotic syndrome, D. Protein losing enteropathy
B: Diabetes insipidus
Answer: B: Diabetes insipidus 
Explanation: This child has low urinary specific gravity.
Amongst the given options only DI causes low urinary specific gravity.