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': 'A 33 year old lady presents with polydipsia and polyuria. Her symptoms staed soon after a road traffic accident 6 months ago. The blood pressure is 120/80mm Hg with no postural drop. The daily Na 130mEq/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: \nSelect and explain. \nA. Central diabetes insipidus, B. Nephrogenic diabetes insipidus, C. Resolving acute tubular necrosis, D. Psychogenic polydipsia', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Answer is D (Psychogenic Polydipsia): Association of decreased urinary osmolality with decreased plasma osmolality along with reduced serum sodium suggests the diagnosis of Primary Polydipsia.', 'role': 'assistant'}]