This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Which is a minor criteria for diagnosis of RF according to modified Jones criteria 
Select and explain. 
A. ASO titre, B. Past history of rheumatic fever, C. Fever, D. Subcutaneous nodules
B: Past history of rheumatic fever
Answer: B: Past history of rheumatic fever 
Explanation: Ref Harrison 19 th ed pg 2152 Table- 381-2 Minor manifestations Clinical: fever, polyahralgia Laboratory: elevated erythrocyte sed- imentation rate or leukocyte counte Electrocardiogram: prolonged P-R interval