An antibiotic is not useful against a virus whereas a vaccine is. Which one of the following is the most appropriate reason for this ?

• A. An antibiotic can break RNA only, whereas virus has DNA.
• B. ​An antibiotic is a carbohydrate in its chemical nature, whereas a vaccine is a protein which works well to kill a virus.
• C. Only a vaccine can break the genetic material of a virus.
• D. A virus does not use biochemical pathways ​​which can be blocked by an antibiotic. But a vaccine can boost an immune system to fight the virus.