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: Medicine
[{'content': 'In a woman with polyuria of 6L/day, which are the 2 most important investigations to be done - \nSelect and explain. \nA. Plasma and urine osmolality, B. Water loading, C. Water deprivation test, D. Plasma osmolality', 'role': 'user'}, {'content': 'Answer: C \nExplanation: fluid deprivation test to differentiate which type of DI. If it is not significant administration of desmopressin required', 'role': 'assistant'}]