This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
The maxillary molar crown of an early fossil primate featured a trigone made of three main cusps; these cusps were: 
Select and explain. 
A. Distobuccal, distolingual and Mesiolingual, B. Distolingual, Mesiobuccal, and linguo buccal, C. Mesiobuccal, Distobuccal and Mesiolingual, D. Mesiolingual, Mesiobuccal and distolingual
C: Mesiobuccal, Distobuccal and Mesiolingual
Answer: C: Mesiobuccal, Distobuccal and Mesiolingual 
Explanation: None