Final answer:
D). Denis the doctor believes that even though Sam the surgeon made a bad joke, not all medical professionals have poor senses of humour. According to the lecture on in-groups and out-groups, the expected conclusion is that not all medical professionals have poor senses of humor despite one surgeon's bad joke.
Step-by-step explanation:
The concept of in-groups and out-groups, as discussed in the lecture, helps explain how individuals perceive and relate to different groups. In this scenario, based on the options provided, we would most expect the conclusion stated in option D). Denis the doctor believes that even though Sam the surgeon made a bad joke, not all medical professionals have poor senses of humour.
This conclusion aligns with the understanding of in-groups and out-groups, as individuals within the same profession can still have different characteristics and behaviors. Denis recognizes that Sam's behavior does not represent the entire group of medical professionals, highlighting the individual differences. This conclusion acknowledges that not all members of a profession share the same traits or abilities.