A 33 yrs old lady presents with polydipsia and polyuria.Her symptoms started soon after a road traffic 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:

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NA

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Central diabetes insipidus

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Nephrogenic diabetes insipidus

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Resolving acute tubular necrosis

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Psychogenic polydipsia

1.	A 33 yrs old lady presents with polydipsia and polyuria.Her symptoms started soon after a road traffic 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:
A.	Central diabetes insipidus
B.	Nephrogenic diabetes insipidus
C.	Resolving acute tubular necrosis
D.	Psychogenic polydipsia
Answer» E.

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