What does "expert testimony" refer to?

Expert testimony refers to the judgement or opinion of a specialist about matters in a specific subject area. This type of testimony is particularly valuable in debates and discussions because experts possess specialized knowledge and experience that enables them to offer insights and perspectives that are not readily available to the general public. When used in advocacy or debate, expert testimony can help to strengthen an argument, as it is based on credible, authoritative sources who can provide evidence and support for the claims being made.

In contrast to some of the other options, which do not accurately capture the essence of expert testimony, this choice emphasizes the reliance on specialized knowledge to inform opinions. For instance, dividing figures or making generalizations based on small samples does not reflect the nuanced and informed perspective that comes from an expert's analysis in their field. Therefore, the selection of this answer highlights the value of informed opinion in arguments, making it significant in the context of effective advocacy and debate.