Which of the following statements about hepatitis-$B$ is incorrect?
- AIt is one of the examples of $STD$.
- BIt is spread primarily by sexual contact,and also by contaminated syringes and blood transfusion.
- CIt is a $42 \ nm$ enveloped virus containing $ss-RNA$ as the genetic material.
- DRecombivax $HB$ vaccine is available to prevent hepatitis-$B$ infection.
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