Final answer:
A patient with pleurisy is likely to exhibit a friction rub breath sound due to the inflamed pleural layers rubbing together.
Step-by-step explanation:
A patient who has pleurisy (inflammation of the lining of the lung) is likely to have friction rub as their breath sound. Pleurisy is characterized by the inflammation of the pleural tissue layers, which can create a distinctive rubbing sound when the pleural layers rub against each other during respiration. This sound is best detected with a stethoscope and is different from crackles, stridor, or rhonchi, which are associated with other respiratory conditions such as pneumonia or bronchitis.