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The correct answer emphasizes the importance of recognizing potentially severe side effects that could indicate a serious condition following the administration of chlorpromazine. Chlorpromazine, which is an antipsychotic medication, can cause agranulocytosis, a serious drop in white blood cell count that results in increased susceptibility to infections. A sore throat and fever are classic signs of infection, particularly in the context of agranulocytosis, and thus warrant immediate reporting and further evaluation.

Monitoring for these symptoms is crucial, as they could suggest that the client is experiencing an adverse reaction related to the medication, which can lead to significant complications if not addressed promptly. Other choices may represent side effects or symptoms that are common or less critical compared to the potential risk of infection indicated by sore throat and fever. Being vigilant for signs of infection, especially in patients taking medications that can affect the immune system, is essential in ensuring client safety post-discharge.