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: Radiology
Radiological feature of Mitral stenosis is are 
Select and explain. 
A. Double contour of right hea border, B. Straightening of left hea border, C. Splaying of carinal angle, D. All
D: All
Answer: D: All 
Explanation: A, B, C i.e. Double contour of right hea border, Straightening of left hea border, Splaying of carinal angle