In the intercuspal position, the lingual cusp of maxillary 2nd premolar contacts the______________?

A. Distal marginal ridge of mandibular 1st premolar

B. Mesial fossa of mandibular 1<sup>st</sup> molar

C. Distal marginal ridge of mandibular 2ndmolar

D. Distal fossa of mandibular 2ndpremolar
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