Poll: Choose both boxes? or just box B?

Newcomb's problem is well-known to philosophers and strongly divides opinion. You can read about the question here:

https://www.theguardian.com/science/alexs-adventures-in-numberland/2016/nov/28/newcombs-problem-divides-philosophers-which-side-are-you-on[0]

You can discuss the question over here:

https://news.ycombinator.com/item?id=13054193[1]

I was wondering how readers of HN would respond, so thought I'd run a quick poll.

Which would you do?