A patient informs you that whenever she is exposed to a particular soap, she experiences a mild allergic reaction. As a knowledgeable EMT, you should recognize that:

A) The soap contains an antigen
B) The patient's airway will swell shut if she inhales the soap
C) The soap contains antibodies that react in the patient's body
D) She must have been exposed to the soap as an infant

A) The soap contains an antigen