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Correct Answer » A:D Explanation

Ans. A & D.
Anterior cerebral artery part of superior arterial supply of optic chiasma where as internal carotid artery contributes to the inferior arterial supply of optic chiasma.
The posterior cerebral artery (PCA) is one of a pair of arteries that supply occipital lobe.
The basilar artery is part of the posterior cerebral circulation. It artery arises from the confluence of the left and right vertebral arteries at the base of the pons as they rise towards the base of the brain (vertebrobasilar system).
It supplies blood to the posterior part of the circle of Willis and joins with blood supplied to the anterior part of the circle of Willis from the internal carotid arteries.
The middle cerebral artery (MCA) is one of the three major paired arteries that supply blood to the cerebrum.
It also supplies blood to the anterior temporal lobes and the insular cortices. The MCAs are not considered a part of the Circle of Willis.