A 24-year-old female presents with fever (38.9°C), malaise, and a dry, nonproductive cough for 5 days. She reports headache, myalgias, and leg pain. Vital signs show HR 102/min, RR 18/min, BP 118/76 mmHg, SpO2 98% on room air. Laboratory studies reveal elevated cold agglutinins (titer 1:512) and mild anemia. Chest X-ray shows interstitial infiltrates. She denies recent antibiotic use. Which microorganism is responsible for her symptoms?

1. A)Klebsiella pneumoniae
2. B)Legionella pneumophila
3. C)Mycoplasma pneumoniaeGABARITO
4. D)Haemophilus influenzae
5. E)Streptococcus pneumoniae