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: Pathology
True about Ghon's focus - 
Select and explain. 
A. Left apical parenchymal lesion, B. Right apical parenchymal lesion, C. Sub pleural caseous lesion in right upper lobe, D. Subpleural caseous lesion just above or below interlobar fissure
D: Subpleural caseous lesion just above or below interlobar fissure
Answer: D: Subpleural caseous lesion just above or below interlobar fissure 
Explanation: Inhaled tubercule bacilli implanted in the distal air spaces of the lower part of upper lobe or upper part of the lower lobe, close to the pleura. This area is about 1 to 1.5 cm with caseating necrosis known as Ghon's focus.
Primary complex or Ghon's complex of tuberculosis consists of 3 components.


Pulmonary compound or Ghon's focus.
Draining lymphatics
Caseating hilar lymph node