Which of the following is a brand name for Diphenhydramine?

Diphenhydramine is an antihistamine commonly used to relieve symptoms of allergy, hay fever, and the common cold. It helps alleviate symptoms such as rash, itching, watery eyes, itchy eyes/nose/throat, cough, runny nose, and sneezing. The brand name for Diphenhydramine is Benadryl, which is widely recognized and used for its effectiveness in treating allergic reactions as well as for its sedative properties.

The other options represent different medications with distinct active ingredients and uses. Tylenol is a brand name for acetaminophen, which is primarily used as a pain reliever and fever reducer. Humulin refers to insulin used to manage diabetes. Zantac, which contains ranitidine, was used to treat stomach acid conditions but has been withdrawn from the market in many places due to safety concerns. Thus, Benadryl is correctly identified as the brand name for Diphenhydramine, emphasizing its key role in treating allergy symptoms.