This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to cope when you feel sick during a dissection
Avoid the smell.
Formaldehyde is used to preserve specimens. Many students report being adversely affected by the smell of formaldehyde during a dissection.

OPTIONS: 1. Talk to your physician about cleaning an electronic device that provides odors during a dissection, if your concerns outweigh those of your doctor. If you find that you won't be affected by the musty odors during a dissection, purchase music cds to comfort you during a dissection.; 2. Try breathing through your mouth as much as you can and stepping away from the specimen when you are able. It might also help to wear a mask.; 3. If your child enters into an dissection before an adult is with them, you should leave the room. You should also avoid withdrawing from your child as your child enters the dissection.; 4. This unpleasant smell lingers for 3 hours after distermination and lasts for five days after dissolution. In order to fight this unpleasant odor, you should avoid it.;
The answer is:
2.