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Question

It was found that milkmaids who had cowpox did not suffer from smallpox later?


A

Since cowpox is more deadly than smallpox.

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B

Scientists have not yet worked out the reason for this

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C

Since smallpox is more deadly than cowpox

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D

Since small pox virus is closely related to cowpox virus

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Solution

The correct option is D

Since small pox virus is closely related to cowpox virus


Since small pox virus is closely related to cowpox virus, the milkmaids who had cowpox were now resistant to the smallpox virus


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