To unlock the fifth wheel, pull the release handle to the position.

The correct answer is "open".

Explanation:

The fifth wheel is an element that couples a heavy-duty pickup truck and a camping trailer. To unlock the fifth wheel it is necessary to pull the release handle to the open position. In the open position of the release handle the fifth wheel is unlocked, which allows to uncouple the heavy-duty pickup truck and the camping trailer

the answer is cell division : )