Which of the following is NOT a sign of dyspnea?

Normal lung sounds indicate that the airways are clear and functioning properly, which does not align with the presence of dyspnea. Dyspnea is characterized by an abnormal difficulty in breathing, and it typically presents with various signs such as increased respiratory rate, labored breathing, and the use of accessory muscles during respiration. When a patient experiences dyspnea, lung sounds may often be abnormal, such as wheezes or crackles, rather than normal. Therefore, the presence of normal lung sounds would suggest that the individual is not experiencing the distress related to dyspnea. This distinguishes "normal lung sounds" as a clear indicator that dyspnea is likely absent.