A green pigment in a leaf absorbs the light energy that photosynthesis uses. What is that pigment called?

Explanation

The pigment is the coloured chemical that traps light, and the organelle that holds it is a different thing altogether: a leaf cell packs many copies of that organelle, and each is coloured by the pigment inside it. Naming the container instead of its contents is the usual slip, and neither the tough material of the cell wall nor the jelly filling the cell absorbs light.