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A 33 year old lady presents with polydipsia and polyuria. Her symptoms staed soon after a road trafic accident 6 months ago. The blood pressure is 120/80 mm Hg with no postural drop. The daily urinary output is 6-8 liters. Investigation showed, Na 130 mEq/L, K.3.5 mEq/L, urea 15 mg/dL, sugar-65 mg/dL. The plasma osmolality is 268 mosmol/L and urine osmolality 45 mosmol/L. The most likely diagnosis is:

ACentral diabetes insipidus
BNephrogenic diabetes insipidus
CResolving acute tubular necrosis
DPsychogenic polydipsia
Medicine
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