Q.

In pulmonary tuberculosis

A. the Ghon complex is a parenchymal peri-hilar lesion
B. bacilli establish themselves in sites of low oxygen tension
C. liquefactive necrosis precedes granuloma formation
D. Langhans cells occur in coalescent granulomas
E. Primary TB causes more damage to lungs than secondary TB
Answer» D. Langhans cells occur in coalescent granulomas
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