At lower doses, causes confusion, memory loss, and hallucination.
a. dramamine
b. heroin
c. cocaine
d. none of the above

Explanation:

None of the above cause confusion, memory loss and hallucination. Those symptoms are caused by higher doses of dramamine, heroin or cocaine.

In addition, dramamine, at overdoses, can cause hallucination, seizures, irritability, dilated pupils and extreme drowsiness.

Heroin, at overdoses, cause confusion, small pupils, lack of response and respiratory deficiency. At last, cocaine, at overdoses, cause elevated heart rate, rise in body temperature, nausea and vomiting, pain in the chest and tremors.

All those symptoms are cause by a higher dose, therefore, none of the above is the answer.

idk im very sorry i wish i could you