Which feature helps to determine whether a maxillary first premolar is from the right or left side?

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The relative height of the lingual cuspThe lingual cusp tilts toward the mesial sideA flattened region located below the distal contact areaThe mesial cusp ridge on the lingual cusp is longerThe presence of a deep central groove on the occlusal surface

Explanation

The maxillary first premolar can be identified as right or left by the mesial inclination of its lingual cusp. This tilt toward the mesial side is a key distinguishing trait, unlike the height of the cusp or the flattened distal area, which are less definitive.