<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 62-year-old woman with type 2 diabetes mellitus comes to the physician because of a 3-month history of fatigue and weakness. Her hemoglobin A1c concentration was 13.5 12 weeks ago. Her blood pressure is 15292 mm Hg. Examination shows lower extremity edema. Serum studies show:K 5.1 mEqLPhosphorus 5.0 mgdLCa2 7.8 mgdLUrea nitrogen 60 mgdLCreatinine 2.2 mgdLWhich of the following is the best parameter for early detection of this patients renal condition?? A: Urinary red blood cell casts, B: Serum total protein, C: Urinary albumin, D: Serum urea nitrogen, E: Serum creatinine,  <response>: This is a question about detecting early renal dysfunction in a patient with longstanding poorly controlled type 2 diabetes mellitus. The patient has signs of fluid overload such as edema and hypertension, as well as laboratory evidence of renal insufficiency with elevated BUN and creatinine. Of the choices given, microalbuminuria choice C is the best early marker of diabetic nephropathy and renal dysfunction. Urinary red blood cell casts indicate more advanced glomerular damage. Serum total protein is not a sensitive marker. BUN and creatinine only become elevated later in the disease process when significant renal insufficiency has already occurred.C: Urinary albumin 