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
True about myxoma is - 
Select and explain. 
A. Mostly seen in left atrium, B. Can metastasize to other sites, C. Rarely recurs after removal, D. Most often seen in right atrium
A: Mostly seen in left atrium
Answer: A: Mostly seen in left atrium 
Explanation: Cardiac myxomas
o Most common primary tumor of the adult heart.
o Benign neoplasms thought to arise from primitive multipotentmesenchymal cells.
o Familial syndromes associated with myxomas have activating mutations in the GNAS1 gene, encoding a subunit of G protein (Gsa) (in association with McCune-Albright syndrome) or null mutations in PRKARIA, encoding a regulatory subunit of a cyclic-AMP- dependent protein kinase (Carney complex).
o About 90% of myxomas arise in the atria, with a left-to-right ratio of approximately 4:1.