<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 12-year-old male child presents to the emergency department with a fever, dry cough, and shortness of breath. The condition began approximately 5 days ago with a rise in body temperature up to 38.7C 101.7F, headache, myalgias, and runny nose. Three days after the onset, the patient started to develop a non-productive cough and later, dyspnea. His vital signs are as follows: blood pressure is 10070 mm Hg, heart rate is 91min, respiratory rate is 29min, and temperature is 38.1C 100.6F. On examination, his oxygen saturation is 88. The patient has a mild pharyngeal erythema and cervical lymphadenopathy. Lung auscultation shows no remarkable findings. Chest radiograph shows patchy reticular opacities best visualized in the perihilar region. A sputum culture is positive for Mycoplasma pneumoniae. Which of the following is consistent with the patients condition?? A: Normal A-a gradient, increased diffusion distance, B: Decreased A-a gradient, increased diffusion distance, C: Decreased A-a gradient, decreased diffusion distance, D: Increased A-a gradient, increased diffusion distance, E: Increased A-a gradient, decreased diffusion distance,  <response>: This is a clinical vignette describing a 12-year-old male child with fever, cough, and shortness of breath for 5 days. Key findings include:- Fever, headache, myalgias, runny nose initially - Non-productive cough and dyspnea developed later- Vital signs show tachycardia, tachypnea, and fever- Hypoxemia with oxygen saturation of 88- Pharyngeal erythema and lymphadenopathy on exam- Patchy reticular opacities on chest X-ray- Sputum culture positive for Mycoplasma pneumoniaeBased on the clinical presentation and positive Mycoplasma culture, this patient likely has Mycoplasma pneumonia. Mycoplasma pneumonia typically causes inflammation and edema in the small airways and alveoli, which impairs gas exchange and leads to hypoxemia. The patchy opacities reflect the diffuse inflammatory process. The question asks about the A-a gradient and diffusion distance. The A-a gradient reflects the efficiency of gas exchange and is often increased in diseases affecting the alveoli and interstitium like pneumonia. Diffusion distance is also increased due to fluid and inflammation in the alveoli and interstitium.D: Increased A-a gradient, increased diffusion distance 