This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
IgA nephropathy can occur in - 
Select and explain. 
A. Membranoproliferative GN, B. Minimal change GN, C. Mesangioproliferative GN, D. RPGN type I
C: Mesangioproliferative GN
Answer: C: Mesangioproliferative GN 
Explanation: Mesangial proliferative glomerulonephritis -

It is characterized by the proliferation of mesangial cells
It is classified according to the predominant type of immunoglobulin present in the glomerulus.

(a) IgG in the mesangium -

Increased no. of mesangial cells in the glomeruli
Immunoflorescence shows the presence of IgG and C3 in the mesangium.

(b) IgA in the mesangium (IgA nephropathy or Berger's disease)

It is characterized by focal segmental or diffuse proliferation of mesangium.
Immunoflorescence shows the presence of IgA deposits in the mesangium C3 is also present.