From the point of view of your immune system, what is the most likely consequence of picking your nose?

The correct answer is that it can result in to put dirt, allergens or pathogen that can lead to activate the immune system and produce the antibodies for such pathogen.

Explanation:

The nose has very thin hairs and mucus that help to prevent the allergen, dirt or pathogen to enter in the inside when we breathe. It is a protection system for the respiratory system. If an individual is picking his nose he can literally insert the dirt, bacteria or another pathogen present on his finger by himself.  

The immune system recognizes these pathogens and produces specific antibodies accordingly

Thus, the correct answer is - it can activate the immune system to respond by producing antibodies.

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."

if you know your abc's you should be able to get your answer or just use google