16. What special circumstance should a rescuer consider when using an AED? A. They should never remove a transdermal medication patch before applying AED pads. B. On a hairy chest, the pads may not stick and may fail to deliver a shock. C. They should never use an AED on someone with an implanted pacemaker. D. AEDs can only be used while a person is submerged in water.

## Step 1<br />The problem is asking us to identify the special circumstance a rescuer should consider when using an Automated External Defibrillator (AED). We need to evaluate each option to determine which one presents a special circumstance.<br /><br />## Step 2<br />Option A suggests that a transdermal medication patch should never be removed before applying AED pads. This is not a special circumstance, but a general guideline.<br /><br />## Step 3<br />Option B suggests that on a hairy chest, the pads may not stick and may fail to deliver a shock. This is a special circumstance because the effectiveness of the AED can be compromised by the hair on the chest.<br /><br />## Step 4<br />Option C suggests that an AED should never be used on someone with an implanted pacemaker. This is not a special circumstance, but a general guideline.<br /><br />## Step 5<br />Option D suggests that AEDs can only be used while a person is submerged in water. This is not a special circumstance, but a general guideline.