According to "Merrill's Atlas," where should the central ray (CR) be centered to best demonstrate the rami for a posteroanterior (PA) mandible projection?

The acanthion.

Explanation:

The acanthion is a point lying near the base of the nose; specifically, the point at the base of the anterior nasal spine that lies on the mesial line; tip of the anterior nasal spine.

the correct answer is d

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