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 Valvular Aortic Stenosis poorest prognosis in indicated when - 
Select and explain. 
A. Angina occurs, B. Syncope occurs, C. Dyspnea occurs, D. Palpitation occurs
C: Dyspnea occurs
Answer: C: Dyspnea occurs 
Explanation: None