Transgenic Plant
The controversy regarding the use of Bt corn is that it

is a potential allergen to humans
both (a) and (b)
is potentially harmful to monarch butterflies
can contaminate groundwater

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Transgenic Plant
Cross protection against viruses in transgenic plants can be obtained by

inoculating the susceptible strain with genes of nucleocapsid
inoculating the susceptible strain of a crop with a mild strain of a virus that helps in developing resistance against more virulent strain
inoculating the susceptible strain with the coat proteins of virulent strain
any of the above

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