Which of the following substances can affect the ability to drive?

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.

• Tranquilizers, marijuana, and sedatives.
• Cough syrups and cold tablets containing codeine or antihistamines.
• All of the above.