Question

At higher doses, __________ can cause hallucinations, feelings of strength, seizure, and coma. A. ketamine B. dextromethorphan C. PCP D. All of the above

Answer 1

The correct answer here is D. All of the above. 

Answer 2

The correct answer is option D: "All of the above". This is due to the fact that Ketamine (also known as Special K), Dextromethorphan and Phencyclidine (also known as PCP or Angel Dust) are dissociative drugs that can cause all of the effects mentioned when used at higher doses. When a drug is dissociative, it means they can cause auditory and visual distortions (like hallucinations) and they do so by  altering the actions of a brain chemical called glutamate at certain types of receptors that are specific for glutamate called: N-methyl-D-aspartate (NMDA) receptors that are located in various parts of the body, specifically on nerve cells throughout the brain.