This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Microbiology
A patient presents with symptoms of cough, hemoptysis, and glomerulonephritis. His C-ANCA levels in serum were found to be raised. The most likely diagnosis is 
Select and explain. 
A. Goodpasteur's syndrome, B. Classic polyaeritis nodosa, C. Wegener's granulomatosis, D. Kawasaki syndrome
C: Wegener's granulomatosis
Answer: C: Wegener's granulomatosis 
Explanation: Renal and pulmonary symptoms with positive c-ANCA suggest the diagnosis of Wegener&;s glomerulonephritis.The clinical syndrome of Wegner granulomatosis may be very similar to classical PAN or microscopic polyangiitis.