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: Medicine
In a patient with previous history of congestive cardiac failure, during dental treatment if he shows sign and symptoms. The preferable patient position should be: 
Select and explain. 
A. Trendelenberg position, B. Upright position, C. Reverse trendelenberg position, D. Left lateral position
B: Upright position
Answer: B: Upright position 
Explanation: None