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 primary teeth that present the most outstanding morphologic deviations from permanent teeth are: 
Select and explain. 
A. Central incisors, B. Mandibular first molar, C. Mandibular second molar, D. Canines
B: Mandibular first molar
Answer: B: Mandibular first molar 
Explanation: None