This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Medicine
Reverse splitting of S2 is seen in all except 
Select and explain. 
A. LBBB, B. WPW type A, C. Systemic hypeension, D. Post-stenotic dilatation in AS
B: WPW type A
Answer: B: WPW type A 
Explanation: Causes of the reversed splitting of the second hea sound: Delayed aoic closureDelayed electrical activation of the LVComplete LBBB (proximal type)RV paced beatRV ectopic beatsProlonged LV mechanical systoleComplete LBBB (peripheral type)LV outflow tract obstructionHypeensive cardiovascular diseaseAeriosclerotic hea diseaseChronic ischemic hea diseaseAngina pectorisA decreased impedance of the systemic vascular bedPost-stenotic dilatation of the aoa secondary to aoic stenosis or regurgitationPatent ductus aeriosusEarly pulmonic closureEarly electrical activation of the RVWolff-Parkinson-White syndrome, type BRef: Hurst's The Hea 13/e Table- 14-8