15. You use eye drops to keep your contacts moist. At first it was just once in the morning, but now it seems you are using eye drops every hour or your eyes just seem to dry out. This increased need for eye drops can be considered an example of _______ and may be due to a mild _______ to eye drops.
(A) tolerance; addiction
(B) sensitization; habituation
(C) withdrawal effects; addiction
(D) counter conditioning; habituation
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