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
Mc Callum's patch is diagnostic of - 
Select and explain. 
A. Infective endocarditis, B. Rheumatic endocarditis, C. Myocardial infarction, D. Tetralogy of Fallot (ToF)
B: Rheumatic endocarditis
Answer: B: Rheumatic endocarditis 
Explanation: None