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
Complement level is reduced in: 
Select and explain. 
A. Minimal change, B. Membranous, C. Focal & segmental, D. Membrane proliferative GN
D: Membrane proliferative GN
Answer: D: Membrane proliferative GN 
Explanation: Ans. D. Membrane proliferative GNMembranoproliferative GlomerulonephritisCauses of Membranoproliferative Glomerulonephritis1. Type I Disease (Most Common)a. Idiopathicb. SLEc. Endocarditisd. Hepatitis Ce. Hepatitis Bf. Mixed cryoglobulinemiag. Cancer: Lung, breast, and ovary (germinal)2. Type II Disease (Dense Deposit Disease)a. Idiopathicb. C3 nephritic factor-associatedc. Partial lipodystrophy3. Type III Diseasea. Idiopathicb. Complement receptor deficiencyClinical Featurea. They present with microscopic to gross hematuria and selective or non - selective proteinuria depending on the severity of the disease.b. They have a poor prognosis, developing renal failure 5-10 years after diagnosis.c. Complement level is reduced