Unfortunately, only the Preview application allows for grayscale printing (at least on my macbook pro). Take these steps to allow you to print in black and white in any application.
1) When you press Print in any application, you will have an option of "Preview" that is close to bottom left. Click on the Preview button.
2) This will open the document in Preview (the software program) as a PDF. Now click File > Print.
3) There should be a dropdown menu where "Preview" is currently selected. Click the dropdown menu and select "Quality & Media."
4) A checkbox titled "Grayscale Printing" should appear at the bottom. Check this box.
5) Push Print