Is writing the most important invention?

I went to a museum last month about science, industry and technology. They asked a question -

What do you think is the most important technology ever invented? The were choices up on the wall next to the question.

I chose Writing. It is not a popular choice.... What do you think were the top 5 technologies (although that word itself is a bit misleading) from 228705 votes in total. 6th was Computer Games, and 7th was AC Electricity. Feel free to add a comment with your guess. I'll post the photo of the answers in a couple of weeks or so.