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Which of the following substances can affect the ability to drive?
A.  Tranquilizers, marijuana, and sedatives.
B.  Cough syrups and cold tablets containing codeine or antihistamines.
C.  All of the above.
A number of drugs can impair your ability to drive, including depressant medications like tranquilizers and sedatives; over-the-counter cough syrups, cold tablets, and allergy medications (which may contain impairing substances like alcohol, codeine, or antihistamines); and illegal drugs.
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