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: Pediatrics
The Finnish type of congenital nephritic syndrome occurs due to gene mutation affecting the following protein – 
Select and explain. 
A. Podocin, B. Alpha–actinin, C. Nephrin, D. CD2 activated protein
C: Nephrin
Answer: C: Nephrin 
Explanation: Congenital nephrotic syndrome

Infant who develop nephrotic syndrome within the first 3 months of life are considered to have congenital nephrotic syndrome.
The most common cause of this syndrome is finnish-type congenital nephrotic syndrome, an autosomal recessive disorder.
Two most common genes involved are -
i) NPHS1    -->  Coding for nephrin and results in finnish-type nephrotic syndrome.

ii) NPHS2 --> Coding for Podocin and results in FSGS.
Other important genes involved in steroid - resistant nephrotic syndrome