Dryopithecus pattern is the characteristic feature of:: (A) Permanent mandibular 1st molar., (B) Permanent mandibular 3rd molar., (C) Permanent maxillary 2nd molar., (D) Permanent maxillary canine.
Answer is A. In a mandibular first molar mesiolingual cusp joins the distobuccal cusp along the floor of the central fossa, this is known as dryopethicus pattern.