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
Design of the major connector must be determined at the time of: 
Select and explain. 
A. Primary impression making., B. Treatment planning., C. At the time of the final impression making., D. Any of the above.
B: Treatment planning.
Answer: B: Treatment planning. 
Explanation: Design of the major connector must be determined during diagnostic and treatment planning phase, because mouth preparation procedures depend in part on the contemplated design of major connectors.