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
A 45 year old patient presents with history of fever, night sweats and weight loss. On X-ray, a mass in apical lobe of lung is seen. On histopathology, it was found to have caseous necrosis. What is the likely underlying process involved - 
Select and explain. 
A. Enzymatic degeneration, B. Hypersensitivity reaction with modified macrophages, lymphocytes and giant cells, C. Acute decrease in blood supply, D. Decreased supply of growth factors
B: Hypersensitivity reaction with modified macrophages, lymphocytes and giant cells
Answer: B: Hypersensitivity reaction with modified macrophages, lymphocytes and giant cells 
Explanation: . Hypersensitivity reaction with modified macrophages, lymphocytes and giant cells