Which of the following penicillin variants can withstand stomach acid?

Penicillin V is the variant that can withstand stomach acid, making it suitable for oral administration. It is stable in acidic environments, allowing it to be absorbed effectively when taken by mouth, which contrasts with some other forms of penicillin that are degraded by stomach acid and therefore are not effective when administered orally.

Methicillin and cloxacillin, while usable in clinical scenarios, are typically administered via injection and not suitable for oral use due to their instability in acidic conditions. Penicillase-resistant penicillins aim to combat bacterial resistance but do not specifically address stability in the stomach acid. Therefore, Penicillin V stands out as the form that can maintain its efficacy when taken orally.