The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A 75-year-old man is admitted to the hospital because of a 3-day history of a productive cough and shortness of breath. His temperature is 38°C (100.4°F) and respirations are 32/min. Crackles are heard over the right upper and the entire left lung fields. Sputum culture confirms infection with Streptococcus pneumoniae. Despite appropriate therapy, the patient dies. A photomicrograph of a section of the lung obtained during the autopsy is shown. Which of the following mediators is most likely responsible for the presence of the cell-type indicated by the arrow?   (A) Platelet activating factor   (B) Interferon-gamma   (C) Interleukin-10   (D) Leukotriene D4
['(A) Platelet activating factor <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Platelet activating factor \n (B) Interferon-gamma \n (C) Interleukin-10 \n (D) Leukotriene D4 <> possible answers', '  A 75-year-old man is admitted to the hospital because of a 3-day history of a productive cough and shortness of breath. His temperature is 38°C (100.4°F) and respirations are 32/min. Crackles are heard over the right upper and the entire left lung fields. Sputum culture confirms infection with Streptococcus pneumoniae. Despite appropriate therapy, the patient dies. A photomicrograph of a section of the lung obtained during the autopsy is shown. Which of the following mediators is most likely responsible for the presence of the cell-type indicated by the arrow? <> context@']