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どなたか、以下の問題の意味と解き方を解説していただけませんか？
Rheumatic fever is the most serious complication of streptococcal infection, but rheumatic fever is not itself an infection. Rheumatic fever occurs only when, in defending against streptococcal infection, the body's immunological system produces antibodies that also attack the cells of the heart and kidneys.
Which of the following, if true, would contribute most to an explanation of why only streptococcal bacteria give rise to rheumatic fever?
(A)Only certain strains of streptococcal bacteria are associated with rheumatic fever.
(B)The antibodies that the body produces to control a streptococcal infection can attack cells of the mucous membranes.
(C)Antibiotics have not proved as effective against streptococcal infections as they have against some other bacterial infections.
(D)Streptococcal bacteria are the only the only bacteria that are structurally similar to the cells of the body attacked in rheumatic fever.
(E)Rheumatic fever can be misdiagnosed if it is not preceded by a serious streptococcal infection.
正解：D
たびたびの質問で恐縮いたします。
どうも科学系の内容は苦手です・・・
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