I believe it is "Bacilli" because the question give you a hint by saying "<span>rod shaped structures", Bacilli very similar to this description.
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The answer is A. Stressor
<span>The RNA world is the hypothesized format of chemical life that existed prior to our current DNA and RNA world. In the RNA world, RNA molecules formed in the primordial soup and began to evolve by self-replication and mutation. This led to increased complexity, natural selection of "better" RNA and diversification of RNA based life.</span>
It has to be confirmed through scientific tests in a lab.
Morphine and heroin have very similar structures, and they are classified into the group of opioids. All of the opioids, including morphine and heroin lock into endorphin receptors in the central nervous system causing a feeling of intense euphoria.