Final answer:
The medication that might be responsible for the client's condition is Risperidone (option 3).
Step-by-step explanation:
The medication that might be responsible for the client's condition of hyperthermia, seizures, and a heart rate of 200 beats per minute is Risperidone (option 3).
Risperidone is an atypical antipsychotic medication that can cause side effects such as increased heart rate, hyperthermia (elevated body temperature), and seizures. These symptoms are known to be adverse effects of risperidone and should be reported to a healthcare professional immediately.
Other medications listed, such as Sertraline, Asenapine, and Fluphenazine, are not typically associated with such symptoms.