Question: Patient with polyuria and polydipsia with a specific urine density greater than 1.040. From the following options indicate the most probable diagnosis: 
 Options:  <1> Alcohol intoxication <2> Suppression of ADH (vasopressin) by barbiturates. <3> Mellitus diabetes. <4> Lithium toxicity that causes diabetes insipidus. <5> Central deficit of ADH (vasopressin).
3