The correct answer is: a brief video clip of a medical school professor discussing a specific case of using virtual reality.
Indeed, a podcast is basically internet radio and this is a visual era, people are much more inclined to visualize than to listen. Podcasts are a much less popular media than You Tube videos so the audience would be quite smaller.
A photo is better but yet not quite as efficient as a video which provides visual, sound and written inputs that collaborate in the conveyance of knowledge and meaning. A student discussion is too abstract and vague; people not familiar with their terminology would not be able to properly understand the subject of discussion. The correct answer is: a brief video clip of a medical school professor discussing a specific case of using virtual reality.
A brief video from a doctor on a specific case makes it possible to narrow down a vast filed as medicine to a more concrete scenario. It also shows the visual appearance of the system that is being discussed facilitating comprehension of the words the doctor is using to describe the system and the procedure. In literature it is always recommended to authors to “show and tell”. It can be said that a video not only tells but also shows.