Researchers paired rats’ drinking of saccharin-sweetened water with injections of a drug that weakened the immune system. After repeated pairings, sweetened water triggered the rats’ immune systems to break down. What was the conditioned stimulus in the study?
answer choices
A) The drug
B) Sweetened Water
C) The immune system weakened in reponse to the drug
D) The immune system weakening in response to the water.
E) The Immune system getting stronger