A licensed professional is sometimes called as an expert witness to provide an opinion to...

An expert witness is permitted to give opinion evidence because they possess specialized knowledge beyond that of the trier of fact. In professional practice, the defining feature is not advocacy for a party, but independence and objectivity. NPPE-aligned guidance emphasizes that an expert’s primary duty is to the court or tribunal: to assist in understanding technical matters by providing an impartial, fair, and non-misleading opinion within the expert’s area of competence. Option D captures this key requirement of being qualified by special knowledge and providing an unbiased opinion. Option A is incorrect because it describes an advocate; expert witnesses must not “defend” a client in the sense of partisan argument. Option B is too narrow and inaccurate: an expert need not hold a specific Canadian licence (and the role is not simply to confirm/disprove testimony). Option C is also inaccurate because an expert typically does not opine on legal “culpability” (a legal conclusion), but rather on technical facts, standards of practice, causation, and professional judgment within their expertise.