Antibiotics target bacterial infections only

Steps:

• Antibiotics kill or inhibit bacteria, not viruses or cancer cells.
• Lung cancer is a malignancy caused by uncontrolled cell growth, not bacteria.
• HIV is a viral infection that attacks the immune system.
• Cholera is a bacterial infection from Vibrio cholerae.

Why D is correct:

• Cholera is a bacterial disease treatable and curable with antibiotics like doxycycline, per medical definitions of antibiotic action.

Why the others are wrong:

• A incorrectly marks lung cancer as treatable, which requires chemotherapy, not antibiotics.
• B incorrectly marks HIV as treatable, as antivirals like antiretrovirals are used for viral infections.
• C incorrectly marks all as treatable, ignoring that cancer and HIV respond to non-antibiotic therapies.

Final answer: D