A 20 years old man from Africa is evaluated for persistent cough, night sweats, low-grade fever, and general malaise. A chest x-ray revels finding consistent with a ghon complex. Sputum cultures grow acid-fast bacilli. Examination of the hilar lymph nodes in this patients would most likely demonstrate which of the following pathologic changes.
a. caseous necrosis
b. coagulative necrosis
c. fat necrosis
d. fibrinoid necrosis
f. liquefactive necrosis