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

How to avoid psoriasis vaccine complications
Schedule vaccinations between flare-ups.
Receiving a vaccination while you're experiencing a psoriasis flare-up dramatically increases the risk of having an adverse reaction. Let your doctor know that you have psoriasis and try to work around your flare-ups to lower your risk of having complications.

Select from: (1). The vaccine, however, has not been approved for use in the united states. The vaccine is typically a household product for children younger than 3 years old. (2). Keep your vaccination information up to date and monitor your vaccination activities to help prevent your adverse reactions from becoming triggers. Increase your risk for flare-ups by taking different types of over-the-counter treatments. (3). For most people, being infected with psoriasis is something you can discuss with your doctor, but should not do with others. If you have become infected with psoriasis, it is likely you will have a flare-up. (4). The psoriatic flare-up that can happen after you receive a vaccination is called a koebner response. Receive vaccinations in warm weather.
The answer is:
(4).