You Have Been Testing a New Substance

You have been testing a new substance. You are not sure what this drug is, but note that it increases heart rate and blood pressure, the animal appears to be more attentive, and the animal appears to be developing a dependence on the substance. You are sure the substance must be a(n) __________.

A) depressant
B) stimulant
C) hallucinogen
D) opiate

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