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
C-ANCA positivity indicates, antibody formed against- 
Select and explain. 
A. Proteinase 3, B. Myeloperoxidase, C. Cytoplasmic antinuclear antibody, D. Anti centromere antibody
A: Proteinase 3
Answer: A: Proteinase 3 
Explanation: None