This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardio thoracic surgery  , Subject name: Anatomy
Least common site for lung abcess is 
Select and explain. 
A. Right upper lobe, B. Right lower lobe, C. Left lower lobe, D. Left upper lobe
D: Left upper lobe
Answer: D: Left upper lobe 
Explanation: About the site of lung abscess associated with aspiration . "Because of the effect of gravity, foci of infection tend to develop in the subpleural regions of the superior segments of the lower lobes and in the posterior segments of the upper lobes. The right lung is involved more frequently, presumably because of the less acute angle of the right main bronhus. thus the right upper and lower lobes are the most commonly affected, followed by the left lower lobe and right middle lobe." Ref : Schwaz 9/e p.549