Personality Test: Zombie or Grizzly

Make your decision before you read my story below.  Now, suspend your disbelief: there are two doors in front of you, both of which open from the outside only. Once you step through, there is no going back. You cannot stay where you are.  Behind one of the doors is a thousand pound grizzly.  Behind the other door is a flesh-eating zombie.  Which do  you choose.  Answer and explain in the comments section.

The first time I saw a Grizzly it was across a long vista of rolling grassland and meadow–it was loping along, covering a lot of ground, traveling perpendicular to me.  I instinctively froze, glanced at the treeline for something to climb–just looking at that beast, probably 800 pounds of horror, running like an athlete, sent my heart racing, my adrenal gland pumping, the little hairs on my arms and the back of my neck bristling. The thing was easily a thousand yards in the distance–although, at the 35 mph a Grizz can romp, I’d have 20 seconds, give or take, if the wind changed.  Later, I would reflect on the immediate, profound fear response and wonder if my subconscious sense of caution was that strong, or if I was experiencing something more profound, literal instinct. Genetic memory.