<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 53-year-old man comes to the emergency department because of severe right-sided flank pain for 3 hours. The pain is colicky, radiates towards his right groin, and he describes it as 810 in intensity. He has vomited once. He has no history of similar episodes in the past. Last year, he was treated with naproxen for swelling and pain of his right toe. He has a history of hypertension. He drinks one to two beers on the weekends. Current medications include amlodipine. He appears uncomfortable. His temperature is 37.1C 99.3F, pulse is 101min, and blood pressure is 13090 mm Hg. Examination shows a soft, nontender abdomen and right costovertebral angle tenderness. An upright x-ray of the abdomen shows no abnormalities. A CT scan of the abdomen and pelvis shows a 7-mm stone in the proximal ureter and grade I hydronephrosis on the right. Which of the following is most likely to be seen on urinalysis?? A: Urinary pH: 7.3, B: Urinary pH: 4.7, C: Hexagon shaped crystals, D: Positive nitrites test, E: Largely positive urinary protein,  <response>: This is a clinical vignette describing a patient with symptoms and findings consistent with renal colic from a ureteral stone. The key findings are acute onset of severe colicky right flank pain radiating to the groin, nauseavomiting, costovertebral angle tenderness, and CT showing a 7mm proximal right ureteral stone with grade 1 hydronephrosis. The question asks about expected urinalysis findings. In renal colic from ureteral stones, the urine is typically acidic due to increased excretion of organic acids. Urinary pH below 5.5 favors uric acid stones while pH 5.5-7.0 favors calcium stones. Hexagonal crystals may be seen with uric acid stones. Nitrites may be positive if there is infection, which is not described here. Protein may be present with infection or renal parenchymal disease, which are not features in this case.Therefore, the most likely urinalysis finding in this patient is an acidic urine pH, choice B.B: Urinary pH: 4.7 