This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: AIIMS 2018, Subject name: Pathology
Immunofluorescence staining pattern from a kidney biopsy from a 35-year-old patient presenting with proteinuria has been shown below. What is the most probable cause? 
Select and explain. 
A. FSGS, B. PSGN, C. Lupus Nephritis, D. Goodpasture syndrome
C: Lupus Nephritis
Answer: C: Lupus Nephritis 
Explanation: FSGS- Focal segmental glomerulosclerosis is associated with focal involvement of kidneys and deposition of IgM,C3 ,C1q PSGN- It is an immunocomplex disease and granular pattern is observed on immunofluorescence. There is deposition of C3,C1q and IgG in granular pattern Goodpasture syndrome- Auto antibodies against basement membrane ,linear pattern on immunofluorescence Lupus Nephritis- seen in SLE.