GMAT Sentence Correction
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Source: PREP
Level: 3
Most vaccines are derived from weakened or killed strains of the same virus that they prevent, unlike the derivation of smallpox vaccine from a different virus altogether.
- A the derivation of smallpox vaccine from a different virus altogether
- B smallpox vaccine, which is derived from a different virus altogether
- C smallpox's vaccine, which gets derived from a different virus altogether
- D when smallpox vaccine is derived from an altogether different virus
- E the altogether different virus from which smallpox vaccine is derived