In a parasitic relationship, who benefits?

In a parasitic relationship, the parasite benefits at the expense of the host. The parasite derives nourishment and other benefits from the host organism, which can lead to harm or detriment to the host. This type of interaction is characterized by the dependency of the parasite on the host for survival, growth, and reproduction.

The host typically suffers negative consequences, which may include reduced fitness, disease, or even death, depending on the severity of the parasitism. Thus, the correct answer emphasizes the unbalanced nature of this relationship, where the parasite clearly benefits while the host is either harmed or compromised.