Animals belonging to Phylum Chordata are fundamentally characterised by the presence of structures noted as A, B C and D. Identify them and select the correct option.

Options

A. A-Notochord, B-Nerve cord,
C-Gill slits, D-Post-anal part
B. A-Nerve cord, B-Notochord,
C-Gill slits, D-Post-anal part
C. A-Nerve cord, B-Notochord,
C-Post-anal part, D-Gill slits
D. A-Nerve cord, B-Gill slits,
C-Notochord, D-Post-anal part

Answer

B

Explanation

The given figure shows the internal organisation of a hypothetical chordate. It posseses notochord `(B)` either during early embroyonic stage or throughout life. The notochord lies ventral to nerve cord `(A)`. It posseses a post anal tail `(D)` and paired pharyngeal gill slits `(C)`.