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
[{'content': "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 \nSelect and explain. \nA. ade, B. bde, C. abd, D. ad", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]