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
In Rheumatic fever, fibrinoid necrosis occurs in 
Select and explain. 
A. Mycardium, B. Collagen, C. Perciardium, D. Endocardium
B: Collagen
Answer: B: Collagen 
Explanation: None