(B) The drug used to treat anxiety and insomnia is obtained from the plant $Rauwolfia$ $serpentina$. This plant contains an alkaloid called reserpine,

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(B) The drug used to treat anxiety and insomnia is obtained from the plant $Rauwolfia$ $serpentina$. This plant contains an alkaloid called reserpine,which acts as a tranquilizer and is effective in managing high blood pressure,anxiety,and insomnia. Therefore,the correct option is $B$.