Antibiotics target bacterial infections only Steps:

• Identify that antibiotics kill or inhibit bacteria.
• Check each disease: 1 is viral (e.g., flu), unaffected by antibiotics.
• Check 2: fungal or parasitic, requires antifungals or antiparasitics.
• Confirm 3: bacterial (e.g., strep throat), treatable with antibiotics. Why D is correct:
• Antibiotics specifically combat bacterial infections, as per medical definition; only disease 3 fits. Why the others are wrong:
• A includes non-bacterial 1 and 2, ineffective.
• B selects viral 1, which antibiotics cannot treat.
• C includes non-bacterial 2, still ineffective.

Final answer: D