The correct answer to this open question is the following.
Although you did not attach options, a context, or further evidence, we can comment on the following.
What can be concluded from the evidence that coughs and sneezes are natural reflexes and from the evidence that our immune system attacks allergens?
We can conclude that we have a wonderful and smart body that protects us from all kinds of allergies, bacteria, or viruses through the fantastic immunology system.
That is why we have to eat healthily and having a balanced nutrition. Do not forget to rest properly. Many doctors affirm that the best medicine is balanced nutrition, full of fruits, vegetables, proteins, carbs, and more. This way our immunologic system is going to protect us against allergens, and other external factors that could harm us.