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: Medicine
The most common accessory pathways leading to WPW syndrome is: 
Select and explain. 
A. Left free wall, B. Posteroseptal, C. Right free wall, D. Anteroseptal
A: Left free wall
Answer: A: Left free wall 
Explanation: Answer is A (Left free wall) Left free wall accessory pathways are most common. 'Left free wall accessary pathways are most common followed by posteroseptal, right free wall and anteroseptal locations ' -'Braunwald Hea Diseases: Review & Assessment' by Lilly (2012)/Q249 The most common accessary pathway connects the left atrium to the left ventricle followed by posterior septal, right free wall and anterior septal accessary pathways'