This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Rheumatic Fever, Subject name: Pathology
A 9-year-old girl is diagnosed with acute rheumatic fever. Instead of recovering as expected, her condition worsens and she dies. Which of the following is the most likely cause of death? 
Select and explain. 
A. Central nervous system involvement, B. Endocarditis, C. Myocarditis, D. Streptococcal sepsis
C: Myocarditis
Answer: C: Myocarditis 
Explanation: The most common cause of death that occurs during acute rheumatic fever is cardiac failure secondary to myocarditis.