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
Which of the following least resemble permanent tooth? 
Select and explain. 
A. Incisor, B. Canine, C. Mandibular 1st Molar, D. Mandibular 2nd Molar
C: Mandibular 1st Molar
Answer: C: Mandibular 1st Molar 
Explanation: None