How to remove windows 7?

How do I completely remove Windows 7 from my Mac?
I've tried Boot Camp Assistant but I'm not able to select "Install or remove Windows 7 or later version". I tried erasing Boot Camp from Disk Utility but I've no idea what formal I should choose?

The correct way to remove a Boot Camp partion is to use Boot Camp Assistant.Now that you have used the incorrect way, Disk Utility, you now have to erase and reformat your hard drive. Then reinstall OSX.

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