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Which cusp on a maxillary first molar has two ridges: one that forms part of a transverse ridge and the other that forms part of an oblique ridge?

 # Which cusp on a maxillary first molar has two ridges: one that forms part of a transverse ridge and the other that forms part of an oblique ridge?
a. Mesiobuccal
b. Mesiolingual
c. Distobuccal
d. Distolingual


The correct answer is B. Mesiolingual. 


The mesiolingual cusp has triangular ridge as well as buccal ridge as shown in the figure of right maxillary first molar. 

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