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
ASO (Antistreptolysin) test is used for the diagnosis of - 
Select and explain. 
A. Rheumatoid arthritis, B. Typhoid fever, C. Rheumatic fever, D. Rickettsial fever
C: Rheumatic fever
Answer: C: Rheumatic fever 
Explanation: None