Well, that's a silly question! :) .

Disregarding any trick questions, the pen is clearly blue.

If this is a trick question, maybe you're going for "the pen is every color, but blue" since it is reflecting blue light, but that still doesn't explain why you listed red as an option. Unless you're asking about the ink for the pen, in which case there is no way to tell from this picture.

Lemma guess... The pen's color is blue, but the pen ink is red?

The pen is blue I don't know where the red is but its definitely blue.

It's blue. Mmmk, what are you up to?

Is this test meant to test the color blind?

Because otherwise, it's obviously blue.

Attention everyone. The pen is blue. Oh and I have no idea what color the ink is because it's a picture I got from google images... But it's probably blue.

I'm glad I made you'all think though.

And yes it was partially a reference to the movie liar liar.

Don't you love when trick questions don't have a trick? (; Sort of like miss-spelling a word that's speled just like it sounds. hehe (;

The pen's color on the outside is a metallic color as well as indigo, however indigo may be seen as a shade of blue, so blue is still the correct answer, logically speaking.

Originally pen was blue. But later it became red, green etc. So, originally pen was blue as it suits white paper.

That pen is blue

I prefer to write with a nice dark blue ink as opposed to red ink.