This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kidney, Subject name: Medicine
[{'content': 'Proteinuria caused by tubule-interstitial renal disease is confirmed by excretion of - \nSelect and explain. \nA. Albumin, B. Light chain, C. Immunoglobulin A, D. Tamm-Horsfall protein', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Tubular proteinuria is a result of tubulointersitial disease affecting the proximal renal tubules and interstitium. This results in decreased proximal reabsorption of proteins--in paicular, low molecular weight proteins (generally below 25,000 Daltons) such as beta-2 microglobulin (light chain) are excreted Ref Harrison20th edition pg 295', 'role': 'assistant'}]