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: Pathology
Atrial myxoma commonly arises from 
Select and explain. 
A. Left ventricle, B. Left atrium, C. Right ventricle, D. Right atrium
B: Left atrium
Answer: B: Left atrium 
Explanation: Ans. is 'b' i.e., Left atrium