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.

Ex Input:
A 40-year-old man with advanced HIV infection and Mycobacterium avium complex infection experienced rapid cognitive decline after commencement of ethambutol, and symptoms fully resolved with cessation.

Ex Output:
ethambutol


Ex Input:
Retinoic acid may increase the risk of bone marrow transplant nephropathy.

Ex Output:
Retinoic acid


Ex Input:
The fever abated promptly following discontinuation of acyclovir, and radiographic abnormalities resolved over ten days.

Ex Output:

acyclovir