Ascientist attends an annual conference hosted by the american medical association. at which type of event is she most likely to hear a speech given by a world-famous surgeon?
a. keynote address
b. panel discussion
c. social gathering

A. Keynote address

In the Keynote address is most likely a world-famous surgeon would give his/her speech in order to motivate, inspire and challenge pursing scientists and medical professionals in their pursuit of their successful career and the like endeavors. 

The answer is b, as with an inference you make a statement with no evidence