A patient complaining of a chronic cough and facial pain might benefit from which type of imaging study to diagnose their condition?

The option related to a CT scan of the sinuses is the most appropriate choice for a patient presenting with chronic cough and facial pain. This combination of symptoms often suggests a sinus-related issue, such as sinusitis, which can lead to inflammation and blockage of the sinus cavities. A CT scan provides detailed cross-sectional images of the paranasal sinuses, allowing for the visualization of any obstructions, mucosal thickening, or other abnormalities that may be contributing to the patient's symptoms.

Other imaging modalities like a chest X-ray are more suited for evaluating conditions related to the lungs and airways, and would not be as effective in assessing the sinus cavities. An ECG focuses on capturing the heart's electrical activity, which does not relate to the patient's respiratory or facial pain symptoms. An upper GI series is primarily used to assess gastrointestinal issues rather than respiratory or sinus-related conditions. Therefore, a CT scan of the sinuses is the most targeted and informative choice for diagnosing the underlying cause of the chronic cough and facial pain in this scenario.