When Baby Shane crawls towards the edge of the staircase, his mother screams, which startles Shane, and makes him cry. This happens several times, and now whenever Shane passes by the edge of the staircase, he feels afraid. In this example of classical conditioning, the conditioned stimulus is:

The conditioned stimulus is the staircase.

Explanation:

In classical conditioning, a conditioned stimulus (the staircase) is associated with an unrelated consequence called unconditioned stimulus (the screaming). This produces a reaction known as conditioned response (fear).

It's important to realise that any stimulus can become conditioned. In the example, if Shane's mother had screamed at the sight of a dog, the baby would probably be afraid of dogs.  

the correct answer is "hematoma formation, with ligaments that are stretched, partially, of fully torn" ankle sprain are produced by an injury to the tough bands of tissue (ligaments) that surround and connect the bones of the leg to the foot. this causes several damage to the ankle including hematoma formation and ligament injury .