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: Medicine
[{'content': 'Which congenital hea disease is associated with pre excitation ? \nSelect and explain. \nA. Atrial Septal Defect, B. Bicuspid Aoic Valve, C. Ebsteins Anomaly, D. Patent Ductus Aeriosus', 'role': 'user'}, {'content': "Answer: C \nExplanation: ebsteins anomaly is a congenital hea condition which is associated with pre excitation Ebstein anomaly is a rare hea defect in which the tricuspid valve -- the valve between the upper right chamber (right atrium) and the lower right chamber (right ventricle) of the hea -- doesn't work properly. As a result, blood leaks back through the valve and into the right atrium. Ref Harrison 20th edition pg 1553", 'role': 'assistant'}]