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
True about Rheumatic heart disease and Rheumatic fever is/are -a) Caused by group 'A' streptococcusb) Caused by group 'B' streptococcusc) Carrier have high risk of developing RFd) Carrier have low risk of developing RFe) M-5 protein cross reacts 
Select and explain. 
A. ade, B. bde, C. abd, D. ad
A: ade
Answer: A: ade 
Explanation: None