Last week I published the Agile Thursday Quiz about Retrospectives.
Here are the answers from Ben Linders. (who created these questions.)

1) When do you normally do a retrospective?
b is the best answer, all others are wrong or do not reflect the real intention of a retro.

2)  Who should attend the retrospective?
a and c are both valid answers, this questions aims to trigger reaction if the PO should or should attend the retro.

3) What is the best way to do a retrospective?
a

4) What happens with the actions that come out of retrospectives?
b is the correct answer, e is not wrong but doesn’t emphasize enough that it is the team who takes action

Where to learn more about Retrospectives:

 

 

A few of my example Retrospectives