Acute angled cusps in permanent maxillary first molar are:

 # Acute angled cusps in permanent maxillary first molar are:

A. Distobuccal and mesiolingual

B. Mesiobuccal and distolingual

C. Mesiobuccal and distobuccal

D. Mesiolingual and distolingual

The correct answer is B. Mesiobuccal and distolingual.

Explanation:

In the permanent maxillary first molar:

The mesiobuccal and distolingual cusps form acute angles.

The mesiolingual and distobuccal cusps form obtuse angles.

These acute and obtuse angles contribute to the rhomboid-shaped occlusal outline typical of the maxillary first molar.