In this task, you will be given sentences in which your task is to recognize the name of the drug or medicine. Drugs are substances that change a person's mental or physical state. They can affect how your brain works, how you feel and behave, your understanding, and your senses. Although there might be several correct answers, you need to write one of them.

Input: Consider Input: We discuss our observations in the cases of two patients with acyclovir neurotoxicity and review the findings of all previous reports in the English language literature.

Output: acyclovir


Input: Consider Input: Skin necrosis after extravasation of low-dose vasopressin administered for septic shock.

Output: vasopressin


Input: Consider Input: Reversible corneal keratinization following trabeculectomy and treatment with 5-fluorouracil.


Output: 5-fluorouracil