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.

Example Input: Typically, drug-induced neutropenia occurs in a patient receiving a semisynthetic penicillin for two weeks or more.
Example Output: penicillin

Example Input: Acute erythroid leukemia after cyclophosphamide therapy for multiple myeloma: report of two cases.
Example Output: cyclophosphamide

Example Input: In addition, loading with one low oral dose of serine produced psychotic symptoms 5 h later which lasted 3-6 h.
Example Output:
serine