Q. Viruses are [ESIC Chennai May 2012]

(a) One-cell microorganisms with a sample cellular organization whose nucleus lacks a membrane.
(b) Pieces of nucleus acid (DNA or RNA) wrapped in a thin coat of protein that replicate only within the cells of living hosts
(c) Multicellular organisms that live in or on a host to obtain nourishment without providing any benefit to the host
(d) None of the above