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1. মধ্যকর্ণের সংক্রমণের জন্য দায়ী কে ? 

  • A. Streptococcus pneumoniae
  • B. Streptococcus pneumoniae
  • C. Streptococcus pneumoniae
  • D. Streptococcus pneumoniae

Answer: Option A

Explanation:

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