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
True about Dressler's syndrome is all, except 
Select and explain. 
A. Presents as sub sternal chest pain, B. Usually occurs within hours after MI, C. May be due to early use of anti coagulant, D. Responds to aspirin therapy
B: Usually occurs within hours after MI
Answer: B: Usually occurs within hours after MI 
Explanation: Dressler's syndrome (Fibrinous Pericarditis):
It is an autoimmune reaction and manifest after 2 - 3 weeks after MI.