True or False: Common medicines for colds can cause drowsiness.

Answer: A — True

The statement is true because many common over-the-counter medications used to treat colds, such as antihistamines and certain decongestants, can have sedative effects. Antihistamines, in particular, are known for their potential to cause drowsiness as they work by blocking histamine in the body, which can lead to a calming effect on the central nervous system. This is important for drivers to be aware of, as drowsiness can significantly impair their ability to operate a commercial vehicle safely. Choosing the right medication and understanding its effects is crucial to maintaining alertness and ensuring safety while driving.