This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Pathology
Most common primary cardiac tumour? 
Select and explain. 
A. Myxoma, B. Rhabdomyoma, C. Rhabdomyosarcoma, D. Angiosarcoma
A: Myxoma
Answer: A: Myxoma 
Explanation: * The most common primary tumour of the heart is myxoma. It constitutes 50% of all primary cardiac tumours.* Most common site is left atrium.* Most common tumour of heart is metastasis from lung cancer.* Most common tumour of heart valves is papillary elastoma