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12. Morphine and codeine are the chief mind-affecting chemicals in the pain-relieving drug __________. A. heroin B. opium C. methadone D. All of the above
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12. Morphine and codeine are the chief mind-affecting chemicals in the pain-relieving drug __________.

A. heroin

B. opium

C. methadone

D. All of the above

User Mansur
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1 Answer

6 votes
The answer to this question is D
User Vipin Gupta
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