Which of the following symptoms may indicate poor swallow function in a stroke patient?

Coughing during saliva swallowing can be indicative of poor swallow function, especially in a stroke patient. This symptom often suggests that there may be an impairment in the swallowing reflex or that the patient is experiencing aspiration, where food or liquid enters the airway instead of the esophagus. In stroke patients, the neuromuscular control necessary for safe swallowing can be compromised, leading to difficulty managing saliva and other substances effectively.

Other symptoms, while also relevant, are not chosen as the best answer in this context. Excessive pooling of food in the oral cavity typically signifies issues with oral phase control. Inability to create a bolus reflects difficulties in the preparation phase of swallowing but can occur in various other conditions unrelated to stroke. Difficulty with tongue movements may also indicate poor oral control necessitating careful assessment, but the immediate risk associated with coughing during swallowing highlights a more acute danger of aspiration and choking, thus making it the most clear symptom pointing towards poor swallow function in this scenario.