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
Which of the following has a nonfunctional cusp? 
Select and explain. 
A. Mandibular canine, B. Maxillary second premolar, C. Mandibular first premolar, D. None of the above
C: Mandibular first premolar
Answer: C: Mandibular first premolar 
Explanation: None