###Rationale: A wave - Rods & cones.
B wave - muller cells & Bipolar cells.
C wave - RPE.

###Answer: OPTION D IS CORRECT.
###Question: C - wave in electroretinography is due to
###Options:
A. Rods & cones
B. Muller cells
C. Bipolar cells
D. Retinal pigment epithelium
