Select the incorrect statement.

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(A) The correct answer is $A$. $1$. Viroids were discovered by $T. O. Diener$ in $1971$, not by $D. J. Ivanowsky$. $2$. $W. M. Stanley$ demonstrated t

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Viroids were discovered by $D. J. Ivanowsky$.

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(A) The correct answer is $A$. $1$. Viroids were discovered by $T. O. Diener$ in $1971$, not by $D. J. Ivanowsky$. $2$. $W. M. Stanley$ demonstrated that viruses could be crystallized and crystals consist largely of proteins. $3$. $M. W. Beijerinck$ demonstrated that the extract of the infected plants of tobacco could cause infection in healthy plants and called the fluid as $Contagium 	ext{ } vivum 	ext{ } fluidum$ (infectious living fluid). $4$. Tobacco mosaic disease and $AIDS$ are indeed viral diseases.

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