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: Worsening of neurologic syndrome in patients with Wilson's disease with initial penicillamine therapy.
Example Output: penicillamine

Example Input: Patients with vitamin B12 deficiency are exceedingly sensitive to neurologic deterioration following nitrous oxide anesthesia.
Example Output: nitrous oxide

Example Input: Lymphoma developing in a patient with rheumatoid arthritis taking methotrexate.
Example Output:
methotrexate