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: Risperidone withdrawal-related respiratory dyskinesia: a case diagnosed by spirography and fibroscopy.
Example Output: Risperidone

Example Input: PURPOSE: We studied a case of vortex keratopathy that was associated with the use of atovaquone.
Example Output: atovaquone

Example Input: We describe a patient who developed acute cerebellar syndrome after prophylactic intrathecal methotrexate administration and recovered spontaneously.
Example Output:
methotrexate