A professor teaching pharmacology conducts a lecture regarding allergic drug reactions. Which of the following statements made by students verifies the lecture was effective?
a. "Virtually any drug may induce an immunologic response."
b. "Very specific characteristics identify if a reaction is drug-related."
c. "Allergic drug reactions are complex and diverse and may include any of the types of hypersensitivity."
d. "Reactions to drugs and plants are identical."