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
Transverse ridge is prominent on occlusal surface of which of the following deciduous teeth? 
Select and explain. 
A. Mandibular first molar, B. Maxillary first molar, C. Mandibular second molar, D. Maxillary second molar
A: Mandibular first molar
Answer: A: Mandibular first molar 
Explanation: None