Ok I saw this question in Rita 6th edition at the end of chapter 1.

Lessons learned are BEST completed by?

A. The project manager
B. The team
C. The sponsor
D. The stakeholders

I choose A but the correct answer is D. Here is what the explanation said.

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The best answer is stakeholders as their input is critical for collecting all the lessons learned on each project. The term "stakeholders" include all other groups.

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I was like what the hell.....how can it be!? I mean all along we have been told that it's PM that is responsibe, it's PM that does all planning, it's PM who communicates with every one i.e. team, sponsor, stakeholders e.t.c. i.e. he works as a bridge between them and what not so shouldn't PM be the one who will be completing lessons learned!??

PM is the only person who knows project inside out while rest of the persons only have limited knowledge specific to their area or domain.

So I was thinking if we remove the word "BEST" from question and make it "Lessons learned are completed by?" will its answer still be D?