1. A 4-year-old child presents with sudden onset of respiratory distress and chest pain. The chest X-ray shows no signs of infection. What is the most likely diagnosis? A. Acute asthma attack B. Acute pulmonary embolus C. Pneumothorax D. Bronchiolitis Correct Answer: B. Acute pulmonary embolus Rationale: The sudden onset of symptoms and the absence of infection signs on the X-ray make a pulmonary embolus a likely diagnosis, especially if there are risk factors such as a history of coagulation disorders. 2. A 7-year-old patient with cystic fibrosis is experiencing an exacerbation of chronic pulmonary conditions. Which of the following would be an expected finding? A. Decreased sputum production B. Hyperresonance on percussion C. Increased FEV1/FV