The correct answer is A. Chlorophyll.
Chlorophyll is a green pigment that is found in plants and algae. It is responsible for absorbing sunlight and using it to convert carbon dioxide and water into glucose and oxygen. This process is called photosynthesis.
Xanthophyll is a yellow pigment that is also found in plants and algae. It is not as important for photosynthesis as chlorophyll, but it does help to protect plants from damage caused by sunlight.
Carotene is an orange pigment that is found in plants, fruits, and vegetables. It is not as important for photosynthesis as chlorophyll or xanthophyll, but it does help to protect plants from damage caused by sunlight.
Phycobillin is a blue or red pigment that is found in algae and cyanobacteria. It is responsible for absorbing light in the blue and red parts of the spectrum, which is why algae and cyanobacteria can live in very deep water where there is very little light.
In conclusion, the correct answer to the question “Green pigment is called” is A. Chlorophyll.