The English physician Edward Jenner found that if experimental subjects were deliberately infected with cowpox, which caused only a mild illness, they are immune from smallpox.


The English physician Edward Jenner found that if experimental subjects were deliberately infected with cowpox, which caused only a mild illness, they are immune from smallpox.

A. which caused only a mild illness, they are immune from

B. causing only a mild illness, they become immune from

C. which causes only a mild illness, they are immune to

D. causing only a mild illness, they became immune from

E. which caused only a mild illness, they would become immune to


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Correct Answer: E

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