Which one of the following is not a function of the pigment carotenoid?

Carotenoids are accessory pigments that absorb light in the blue-green region and pass the energy to chlorophyll. They give yellow-orange colours to autumn leaves, protect chlorophyll from photo-oxidation, and play a photoprotective role in the human eye (e.g., lutein and zeaxanthin in the macula). However, the reaction centre in photosynthetic pigment systems is formed by chlorophyll a molecules, not carotenoids. Hence, acting as the reaction centre is not a function of carotenoids.