How to manipulate a hidden drop-down menu with javascript?

Hello everybody,

I want to make a choice from a hidden dropdown menu on a web page with a chrome extension, here are the details:

I have to click on the part -pas de réponse- and that will display a hidden drop-down list, with two choices (oui or non) here are the captures with the source codes.

Search the code for “oui (100.0”, and find the actual box.

The HTML must be somewhere in the DOM…

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