Which of the Following Is True Concerning Nickel Allergy

Multiple Choice

Which of the following is true concerning nickel allergy?

A) Men have a higher rate of allergy to nickel than do women,by a ratio of 10 to 1.
B) The overall allergy rate to nickel for the general population is about 1% to 3%.
C) It is more common to see nickel allergy in removable partial dentures than in the margins of base-metal crowns.
D) Some responses to nickel cause a skin reaction rather than a response in the mouth,even though the oral cavity is the source of the nickel.