8. A tourniquet may be left on with little risk of permanent injury for no longer than A. 2 hours B. 10 minutes. C. 20 minutes D. 8 hours

## Step 1<br />A tourniquet is a device used to control or stop the flow of blood in a limb. It is typically used in emergency situations where direct pressure is not sufficient to stop severe bleeding.<br />## Step 2<br />The use of a tourniquet can lead to tissue damage and necrosis if left on for too long. Therefore, it is crucial to limit the time a tourniquet is applied.<br />## Step 3<br />The general guideline for the duration of applying a tourniquet is 1 to 2 hours. This is the maximum time a tourniquet should be left on to minimize the risk of permanent injury.<br />## Step 4<br />In this question, the options provided are 2 hours, 10 minutes, 20 minutes, and 8 hours. Among these options, 2 hours is the maximum time a tourniquet should be left on.