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
In which of the following a nonfunctional cusp is present: 
Select and explain. 
A. Maxillary 1st molar, B. Maxillary 2nd molar, C. Mandibular 1st molar, D. Mandibular 2nd molar
A: Maxillary 1st molar
Answer: A: Maxillary 1st molar 
Explanation: None