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
All of the following are more commonly seen in Klebsiella Pneumonia than in Pneumococcal Pneumonia, Except: 
Select and explain. 
A. Lower lobe involvement, B. Abscess Formation, C. Pleural Effusion, D. Cavitation
A: Lower lobe involvement
Answer: A: Lower lobe involvement 
Explanation: Answer is A (Lower Lobe Involvement): Pneumococcal pneumonias have predilection to involve the right lower lobe, whereas Klebsiella usually affects one of the upper lobes. Features Pneumococcal Pneumonia Klebsiella Pneumonia Consolidation Pattern * Lobar Consolidation with positive air bronchogram sign * Lobar Consolidation with positive air bronchogram sign Lobe Predilection * Predilection to involve Lower Lobe (Any lobe may be involved) * Usually Unilobar (Usually do not expand involved lobe) * Predilection to involve Upper Lobe (Any lobe may be involved) * Often Multilobar (Tendency to expand involved lobe) Abscess * Abscess formation uncommon * Abscess Formation common Pleural Effusion * Pleural Effusion uncommon * Pleural Effusion common Cavitation * Cavitation is rare * Cavitation is common