Which of the following patients exhibits signs and symptoms consistent with cystic fibrosis?

Choice A reason: Audible wheezes and dyspnea suggest asthma or COPD, where bronchoconstriction narrows airways, causing wheezing and shortness of breath. In cystic fibrosis, thick mucus primarily causes airway obstruction, leading to chronic infections and congestion rather than prominent wheezing, which is less specific to this condition. Choice B reason: Difficulty breathing when speaking, dyspnea, and chronic cough are seen in many respiratory conditions, including COPD or chronic bronchitis. While cystic fibrosis involves chronic cough, these symptoms alone are not specific, as cystic fibrosis also includes gastrointestinal symptoms like malabsorption, which are absent in this choice. Choice C reason: Steatorrhea, chest congestion, and limited exercise tolerance are hallmark signs of cystic fibrosis. Thick mucus obstructs pancreatic ducts, causing fat malabsorption (steatorrhea), and clogs airways, leading to congestion and infections, reducing exercise capacity due to impaired oxygen exchange and chronic respiratory compromise. Choice D reason: Sudden absence of wheezing and low SpO2 suggest a critical airway obstruction or pneumothorax, not typical of cystic fibrosis. In cystic fibrosis, chronic mucus buildup causes persistent symptoms, not sudden resolution of wheezing. Low SpO2 may occur, but the sudden change is more indicative of acute conditions.