Select the wrong statements.

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(D) $1$. $W.M. Stanley$ $(1935)$ demonstrated that viruses could be crystallized and crystals consist largely of proteins. This statement is correct.$

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The viroids were discovered by $T.O. Diener$.

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(D) $1$. $W.M. Stanley$ $(1935)$ demonstrated that viruses could be crystallized and crystals consist largely of proteins. This statement is correct.$2$. The term 'contagium vivum fluidum' (infectious living fluid) was coined by $M.W. Beijerinck$ $(1898)$ for the extract of infected tobacco plants. This statement is correct.$3$. Mosaic disease in tobacco is caused by $Tobacco Mosaic Virus$ $(TMV)$,and $AIDS$ in humans is caused by $Human Immunodeficiency Virus$ $(HIV)$. Both are viral diseases. This statement is correct.$4$. Viroids were discovered by $T.O. Diener$ in $1971$,not $D.J. Ivanowski$. $D.J. Ivanowski$ $(1892)$ recognized certain microbes as causal organisms of the mosaic disease of tobacco. Thus,option $D$ is the wrong statement.

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