Which symptom is the most common with a hypersensitivity reaction to a medication?.

Choice A rationale: Urticaria, also known as hives, is a common symptom of a hypersensitivity reaction to a medication. Choice B rationale: Vomiting can occur but it is not the most common symptom. Choice C rationale: Wheezing can be a symptom of a severe allergic reaction, but it is not the most common. Choice D rationale: Anaphylaxis is a severe, life-threatening allergic reaction, but it is not the most common symptom.