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 occlusal surface of a primary mandibular first molar often has a prominent faciolingual ridge. This transverse ridge connects which two cusps? 
Select and explain. 
A. Buccal and distolingual., B. Mesiolingual and distobuccal., C. Mesiobuccal and mesiolingual., D. Distobuccal and distolingual.
C: Mesiobuccal and mesiolingual.
Answer: C: Mesiobuccal and mesiolingual. 
Explanation: Transverse ridge connecting MB and ML cusps.