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
There are sharp demarcations between pulpal chambers and pulp canals in which of the following teeth? 
Select and explain. 
A. Mandibular second premolars, B. Maxillary first premolars, C. Maxillary lateral incisors, D. Mandibular canines
B: Maxillary first premolars
Answer: B: Maxillary first premolars 
Explanation: None