A patient has a lung tumor. He is thirsty and drinks water constantly. The urine has decreased osmolarity and the blood has increased osmolarity. When injected ADH the osmolarity did not change. The cause of the patient's excess urine volume is:
O Dehydration
O None of the answers listed
O Syndrome of inappropriate ADH
O Nephrogenic diabetes insipidus
O Central diabetes insipidus
