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: Ans. is 'a' i.e., Lower lobe involvement Pneumococcal pneumonias have predilection to involve the right lower lobe, whereas Klebsiella usually affects one of the upper lobes. Features Pneumoccoccal 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) Commonly involves posterior segment of the rightupper lobe (Bulging fissure sign Abscess Abscess formation uncommon Abscess formation rare but more common than streph Pleural effusion Pleural effusion uncommon Pleural effusion common (empyema) Cavitation Pleural effusion uncommon Cavitation is common