The nerve chord in earthworm originates from

Options

A. Supra-pharyngeal ganglia and has a fused pair of ganglia in each segment from the `3^(rd)` to the last
B. Supra-pharyngeal ganglia and has a fused pair of ganglia in each segment from the `4^(th)` to the last
C. Sub-pharyngeal ganglia and has fused pair of ganglia in each segment from the `5^(th)` to the last
D. Sub-pharyngeal ganglia and has a fused pair of ganglia in each segment from the `6^(th)` to the last

Answer

C

Explanation

Ventral nerve cord is long thread like double layered structure which arises from the posterior part of sub– pharyngeal ganglia and runs the posteriorly up to last segment of body and extend from 5th to last segment.