The correct option is
A Porphyrin head and phytol tail
Chlorophyll is a bluish-green or olive-green colour pigment soluble in organic solvents like alcohol, acetone etc. It is made up of a squarish tetrapyrrolic ring or porphyrin known as head and a phytol alcohol known as the tail. It posses -
CH3 group or
CHO group which links pyrrole rings of porphyrin head to form ring system and the Mg atom is present in the central position of the tetrapyrrolic ring.
So the correct option is 'Porphyrin head and phytol tail'.