The viral infection hepatitis A can be most effectively controlled by which of the following methods?

• A. Vaccination
• B. High-protein diet
• C. Antibiotic therapy
• D. Use of insect repellents

Answer: (A)

Verified step by step guidance

1. Step 1: Understand the nature of hepatitis A, which is a viral infection primarily transmitted through the fecal-oral route, often via contaminated food or water.
2. Step 2: Recognize that antibiotics are ineffective against viruses, so antibiotic therapy is not a suitable control method for hepatitis A.
3. Step 3: Consider that a high-protein diet may support general health but does not prevent or control viral infections like hepatitis A.
4. Step 4: Note that insect repellents are used to prevent vector-borne diseases transmitted by insects, which is not relevant for hepatitis A transmission.
5. Step 5: Identify vaccination as the most effective method to control hepatitis A by inducing immunity and preventing infection.