Rheumatic fever is a sequelae of repeated infection with Streptococcus pyogenes. The pathogenesis involved in this complication is
A. Molecular mimicry in which some of the bacterial proteins resembles those of endocardium
B. An immunological response to specific 'M' protein
C. An immunological response to the antigen determining the Lancefield classification of the bacterium
D. Antigen-antibody complex precipitation on the valves of the heart
Answer: A. Molecular mimicry in which some of the bacterial proteins resembles those of endocardium
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