This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
what is the diagnosis of the above pressure volume graph ? 
Select and explain. 
A. mitral stenosis, B. mitral regurgitation, C. aoic stenosis, D. normal
B: mitral regurgitation
Answer: B: mitral regurgitation 
Explanation: ref : guyton and hall