Darklands Puzzle #26

The path is blocked by a heavy iron door. Carved above it is an inscription:
TOUCH THE NEXT TO PASS.
1 1 2 3 5 8 13 21 34 55
On the door are different plates, each with numbers. Which should you touch? The wrong choice could (will. ed.) release a terrible doom trap! You consider carefully, then touch...
...85.
...89.
...99.
...100.
...123.

(Source: Darklands cluebook by MicroProse Software)

The writers at MicroProse have made another small error: this is almost but not quite the Fibonacci sequence. (The Fibonacci sequence starts with zero and one.) One must touch 89.