<prompt> 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 ?Diabetes mellitusDiabetes insipidusCongenital nephrotic syndromeProtein losing enteropathy  <response>: Ans. is b i.e., Diabetes insipidus o This child has low urinary specific gravity. o Amongst the given options only DI causes low urinary specific gravity. 