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 Length of the proximal guide plane is of the enamel crown portion of the tooth from the marginal ridge cervically is: 
Select and explain. 
A. 3-Jan, B. 3-Feb, C. 2-Jan, D. Entire length
B: 3-Feb
Answer: B: 3-Feb 
Explanation: None