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Answer :

Answer:

[B]  Streptococcus bacteria

Explanation:

Rheumatic heart disease starts as a sore throat from a bacterium called Streptococcus pyogenes (group A streptococcus). Thus, Rheumatic heart disease is caused by Streptococcus bacteria.

[RevyBreeze]

Answer:

I think your answer is B. streptococcus bacteria

Explanation:

damage to heart valves caused by one or several episodes of rheumatic fever, an autoimmune inflammatory reaction to throat infection with group A streptococci (streptococcal pharyngitis or strep throat).