Write an inquisitive question about a specific text span in a given sentence such that the answer is not in the text.

Let me give you an example: Sentence: The Obama administration is developing additional screening protocols for airline passengers both overseas and in the United States to control infectious diseases such as Ebola, President Barack Obama said Monday .<sep>Span: Obama administration
The answer to this example can be: What was the duration of the Obama administration?
Here is why: It is an inquisitive question based on the specific span of the sentence.

OK. solve this:
Sentence: The proposals that emerged focus on schools , which Valls calls an " essential link " in transmitting French values of tolerance and freedoms .<sep>Span: " essential link "
Answer:
How are schools the essential link to passing French values?