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: Anatomy
True statement about Rt coronary aery (RCA) 
Select and explain. 
A. Diameter less than LCA, B. RCA arises from anterior aoic sinus, C. RCA supplies major pa of right atrium and right ventricle, D. All
A: Diameter less than LCA
Answer: A: Diameter less than LCA 
Explanation: A i.e. Diameter less than LCA; B i.e. RCA arises from anterior aoic sinus