This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular Radiology, Subject name: Radiology
On X-ray chest PA view, the anterior surface of the hea is formed by: 
Select and explain. 
A. Right ventricle, B. Left ventricle, C. Right atrium, D. Left atrium
A: Right ventricle
Answer: A: Right ventricle 
Explanation: The Right ventricle forms the front of the hea with a contribution at its upper pa from the Right atrial appendage.