The PHN Realizes That the Mere Presence of an Agent

The PHN realizes that the mere presence of an agent, even if it is known to have toxic properties, does not necessarily mean there is a risk to health. Whether or not there is an adverse response to a toxin is primarily influenced by all but which of the following:

A) Its inherent toxicity, that is, ability to cause harm to humans
B) Whether it enters the body and reaches susceptible organs
C) The amount that is present
D) The route of exposure