Odd One Out Shapes Picture Puzzle

Here are some Mathematical shapes given the the picture puzzle image. Can you tell logically which is the Odd One Out among these six picture?

Can you tell which picture is Odd One Out?

Answer can be viewed by clicking on button. Please do give your best try before looking at the answer.

There could be many different answers depending upon the logic used. Here are some of the logical answers to this odd one out shapes picture puzzle.
Answer could be 3 as it is the only shape which is not symmetrical to central vertical axis.
Answer could be 2 as it is the only shape which does not have a corner. 

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