Final answer:
The 'Win, Win' situation in species interaction where both organisms benefit is called mutualism, which is a type of symbiosis.
Step-by-step explanation:
The species interaction described in the question, where both organisms benefit from the relationship despite being different species, is known as mutualism. This is a specific type of symbiotic relationship in which both species involved in the interaction gain an advantage that helps them thrive within their environment. The other types of symbiotic relationships, for comparison, are commensalism, where one species benefits and the other is not significantly affected, and parasitism, where one organism, the parasite, benefits at the expense of the other, the host. Therefore, the correct answer to the question is A) Symbiosis.