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
Mesial marginal developmental groove is seen in 
Select and explain. 
A. Maxillary 1st premolar, B. Mandibular lateral incisor, C. Maxillary lateral incisor, D. Mandibular 1st premolar
A: Maxillary 1st premolar
Answer: A: Maxillary 1st premolar 
Explanation: Mesial Aspect

From the mesial and distal aspect both the buccal and lingual cusps are visible
A well developed mesial marginal ridge and a mesial marginal developmental groove is present
In the middle of the mesial surface is the mesial developmental depression which continues beyond the cervical line