A 56-year-old man experienced fever, chills, headache, sore throat, and malaise. Symptoms progressed to difficulty in breathing, night sweats, nausea, and vomiting. He went to the hospital after 3 days. At admission, he was afebrile, and his heart rate was 100 beats per minute. Physical examination found decreased breath sounds and rhonchi. His complete blood count was unremarkable, and serum chemistries and renal functions were normal. Arterial blood gas did not show hypoxia. A chest radiograph showed a widened mediastinum, and a computed tomography scan showed mediastinal edema. Blood cultures were collected, and gram-positive bacilli grew within 11 hours. The patient was started on ciprofloxacin, rifampin, and clindamycin. The patient developed respiratory distress, and he was treated with diuretics, corticosteroids, and underwent thoracentesis. The patient eventually recovered. Picture1;’,.png Identify the organism. Group of answer choices Botulinum toxin Bubonic plague Ricin Bacillus anthracis