<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 68-year-old man presents to his primary care physician for a routine checkup. He currently has no complaints. During routine blood work, he is found to have a slightly elevated calcium 10.4 mgdL and some findings of plasma cells in his peripheral blood smear less than 10. His physician orders a serum protein electrophoresis which demonstrates a slight increase in gamma protein that is found to be light chain predominate. What is the most likely complication for this patient as this disease progresses if left untreated?? A: Peripheral neuropathy, B: Kidney damage, C: Raynauds phenomenon, D: Splenomegaly, E: Hepatomegaly,  <response>: This is a clinical vignette describing a 68-year-old man with mildly elevated calcium, plasma cells in his blood, and increased light chain gamma proteins on serum electrophoresis. This presentation is most consistent with monoclonal gammopathy or multiple myeloma. The key finding is the light chain predominance, which indicates a plasma cell dyscrasia. As multiple myeloma progresses, it can cause end-organ damage. The most common complication is kidney dysfunction from light chain cast nephropathy. B: Kidney damage 