In pheretima nephridia occur in

Options

A. All segmen except 1-4 and 10-14
B. 1-2, 4-6, 15 to last segments
C. Meganephridia in pre- clitellar and microphridia in post- clitellar segments
D. Micronephridia in all segments meganephridia from clitellar region to end

Answer

D

Explanation

Nephridia are absent in the first three segments and the last segment Some workers believe that all the nephridia are of micronephridia type Other consider septal nephridia to be meganephridia