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What are antibiotics effective against?

  1. Bacterial infections

  2. Cold viruses

  3. Flu viruses

  4. Fungal infections

The correct answer is: Bacterial infections

Antibiotics are specifically designed to fight against bacterial infections, making option A the correct answer. Bacterial infections are caused by bacteria, which are single-celled organisms that can invade the body and cause illness. Antibiotics work by killing the bacteria or stopping their growth, which helps to eliminate the infection. Options B and C are incorrect because antibiotics only target bacteria, whereas cold and flu viruses are caused by a different type of pathogen, a virus. Antibiotics are not effective against viruses, so they would not be helpful in treating a cold or flu. Option D is also incorrect because antibiotics are not designed to combat fungal infections. Fungal infections are caused by fungi, which are different from bacteria and require a different type of treatment. Therefore, antibiotics would not be effective in treating a fungal infection. Overall, the best option is A because antibiotics are designed specifically for bacterial infections and are not effective against viruses or fungal infections.