This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Surfaces and Grooves, Subject name: Anatomy
In PA view CXR, right border of the hea is contributed by- 
Select and explain. 
A. pulmonary trunk, B. ascending aoa, C. left atrium, D. right ventricle
B: ascending aoa
Answer: B: ascending aoa 
Explanation: Right border of hea SVC Right atrium IVC Ascending aoa