An Anatomically Unusual Cilium Is Found in Which Ocular Structure

An anatomically unusual cilium is found in which ocular structure?

A) In connective tissue cells of the choroid
B) In rod photoreceptor cells,at the junction of the inner segment with the outer segment
C) On smooth muscle cells of the constrictor pupillae
D) On the surface of epithelial cells of the ciliary processes
E) Projecting from pigment epithelial cells of the retina