Her reasons for leaving were 'obvious'. = It's 'obvious' why she left.
You are stating 'the obvious'. Tell me something I don't already know.
Her doctor immediately noticed the 'obvious' signs of the disease.
(..) I didn't win a competition. I wasn't part of a lottery. I was selected. It's obvious, once I stop to think. Why would you randomly select an examiner for the Turing Test? You could have had some bean (..)2014 Ex Machina