This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thorax, Subject name: Anatomy
Base of the hea is formed by 
Select and explain. 
A. Right atrium, B. Right ventricle, C. Left atrium, D. Left ventricle
C: Left atrium
Answer: C: Left atrium 
Explanation: Base of hea is formed by left atrium and the small pa of right atrium. BD CHAURASIA&;S HUMAN ANATOMY.VOLUME 1. 6TH EDITION.PAGE NO 253