Which of the following is classified as a dangerous drug according to the Ohio Board of Pharmacy?

The classification of a dangerous drug according to the Ohio Board of Pharmacy specifically includes substances that are subject to more stringent regulations due to their potential for misuse, abuse, or harm. Products labeled "Caution: Federal Law Prohibits Dispensing Without Prescription" indicate that these pharmaceuticals require a prescription for legal dispensing. This label signifies that the substances are considered to have a higher risk and need medical oversight for safe use, which aligns with the criteria for dangerous drugs.

In contrast, the other choices lack the distinguishing regulatory implications that B embodies. Products labeled "Over the Counter" are available for consumer purchase without a prescription and do not fit the classification of dangerous drugs, as they are deemed safe for self-administration. Labels stating "Natural Supplement" do not indicate a prescription requirement and are often not regulated in the same way as prescription medications. Lastly, products with a child's warning are meant to alert caregivers to potential hazards for children but do not inherently classify a drug as dangerous on their own. Thus, the correct answer highlights the importance of prescription requirements in identifying dangerous drugs.