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Bacilli often cause which disease?

  1. Tuberculosis

  2. Malaria

  3. Flu

  4. Ebola

The correct answer is: Tuberculosis

Bacilli is a type of bacteria that causes tuberculosis, not malaria, flu, or Ebola. Malaria is caused by another type of organism, the protozoan parasite. Flu is caused by influenza virus and Ebola is caused by the Ebola virus. Tuberculosis is the only disease caused by a bacillus. Therefore, the correct answer is A.