Final answer:
A physician who testifies as an expert in court is allowed to provide specialized knowledge and opinions in the relevant field.
Step-by-step explanation:
When a physician is testifying as an expert in court, they are allowed to testify about their specialized knowledge and opinions in the relevant field. This includes providing explanations, interpretations, or conclusions based on their expertise. Unlike a regular or "fact" witness who can only provide factual information about what they personally observed or experienced, an expert witness can offer professional insights and analysis that can assist the judge or jury in making informed decisions.