Tens of thousands of doctors and nurses ‘to be trained as apprentices’

What do you think the response 'Yeah.' signifies in a conversation?

In what contexts might someone respond with 'Yeah.'?

How does the tone of the word 'Yeah.' change the meaning of the response?

Can 'Yeah.' be considered a complete answer? Why or why not?

What emotions or attitudes might be conveyed through the response 'Yeah.'?