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: Medicine
A patient presents with multiple pulmonary cavities hematuria and red cells casts. The most likely diagnosis is - 
Select and explain. 
A. Anti GBM disease, B. Churg - Strauss allergic granulomatosis, C. Wegner's granulomatosis, D. Systemic lupus erthematous
C: Wegner's granulomatosis
Answer: C: Wegner's granulomatosis 
Explanation: None