Q: In this task, you will use your knowledge about language (and common sense) to determine what element the marked number refers to. The numbers are marked with two underlines around them, like: _ number _. Your answer should be chosen from the given text, and should not contain other words.
Alex Blake: Identical twins ! What are the odds ?
David Rossi: About _ 3.5 _ per thousand
David Rossi: Well
David Rossi: , I asked the Reid the same question .
A:
odds