MDS AIPGDEE preparations B-IDS | distolingual cusp of the maxillary first molar MCQ

In centric occlusion, the distolingual cusp of the maxillary first molar will contact:
a. the mesial marginal ridge of the mandibular first premolar and distal marginal ridge of the second premolar
b. the distal marginal ridge of the mandibular second premolar and mesial marginal ridge of the first molar
c. the distal marginal ridge of the mandibular first molar and mesial marginal ridge of the second molar
d. the distal marginal ridge of the mandibular second molar and mesial marginal ridge of the first molar

Ans. C. The distolingual cusp of a maxillary molar is a holding cusp. The general rule for maxillary holding cusps is as follows:

a maxillary holding cusp contacts the distal marginal ridge of its mandibular counterpart and the mesial marginal ridge of the mandibular tooth distal to its counterpart, EXCEPT FOR THE MESIOLINGUAL CUSPS OF THE MOLARS, WHICH CONTACT THE CENTRAL FOSSAE OF THEIR COUNTERPARTS. This should be the distal marginal ridge of the mandibular first molar and mesial marginal ridge of the second molar.