A Patient Is Having Skin Testing Done to Assess for Allergies

A patient is having skin testing done to assess for allergies. The nurse realizes that evidence of an exposure to an antigen would be

A) itching at the site.
B) an area of approximately 1 mm of induration and erythema.
C) only evident after five days.
D) an area of greater than 10 mm of induration and erythema.