A pediatric client is recovering from an anaphylactic reaction to an allergen which brought him to the ED. The client's mother is quite concerned with the potential reoccurrence of her child's reaction. In attempting to narrow down the possible allergen, it is important to consider that clinical manifestations generally correlate with:

A. route of exposure
B. respiratory symptoms
C. systemic effects
D. skin reactions

A. route of exposure

Explanation:Route of exposure refers to how someone got exposed to that allergen that got them sick. There are different routes of exposure , the way in which a substance enter one's body , it can be through inhalation, ingestion , skin absorption and injection. For example inhalation occurs mostly when a substance is a chemical in the form of vapours , gases , particulates and mist .

For this reason by knowing how it entered the body the pediatrician can determine what the substance might have been.

there is an explationation of this on a site called crash   course world history 1

an aneroid barometer is different from a mercury barometer in that it provides readings that increase as air pressure increases.

hope it : )