Which of the following symptoms is associated with CNS issues?

The symptom associated with central nervous system (CNS) issues is the loss of speech or hearing. This reflects the role of the CNS in controlling functions related to communication and processing sensory information. The brain's ability to facilitate speech involves complex areas dedicated to language, while hearing relies on auditory pathways. When there are disturbances or damage within the CNS, such as from a stroke, traumatic brain injury, or other neurological disorders, it can result in communication deficits or changes in sensory perception.

In contrast, the mottled reddish rash might indicate a dermatological issue or an allergic reaction, and the deep sharp pain in the sternum is typically related to cardiovascular or respiratory problems rather than CNS issues. Explosive noise could relate to psychological responses, such as a startle reflex or a phobia, but does not directly indicate CNS dysfunction. Thus, the loss of speech or hearing is a clear indicator of potential problems within the central nervous system.