<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 22-year-old woman presents to her primary care provider with an unrelenting headache accompanied by fever, chills, and malaise for the past 4 days. She also complains of an earache and dry hacking cough. Past medical history is noncontributory. She takes oral contraceptives and a multivitamin with calcium daily. She drinks alcohol socially and smokes occasionally. Today, her temperature is 37.9C 100.2F, pulse is 104min, respiratory rate is 20min and blood pressure is 10282 mm Hg. On physical exam, she appears uncomfortable, but not ill. Her heart rate is elevated with a regular rhythm and her lungs have mild rhonchi in the lower lobes bilaterally. A chest X-ray shows patchy, diffuse infiltrates of the interstitium bilaterally that is worse in the lower lobes. A sputum culture is taken for stereomicroscopy. The pathogen organism appears small, pleomorphic, and lacks a cell wall. Which of the following is the most likely pathogen?? A: Streptococcus pneumonia, B: Legionella pneumophila, C: Staphylococcus pneumonia, D: Mycoplasma pneumonia, E: Haemophilus influenza,  <response>: Based on the clinical presentation described in the question stem, the most likely diagnosis is atypical pneumonia caused by an intracellular organism. Key findings supporting this include the patients age, symptoms of headache, fever, chills, malaise, earache, and dry cough, along with patchy infiltrates on chest X-ray and a sputum culture showing a small, pleomorphic organism lacking a cell wall. The choices provided include both typical and atypical pneumonia pathogens. Streptococcus pneumoniae, Staphylococcus pneumoniae, and Haemophilus influenzae are typical causes of bacterial pneumonia that would be expected to have a cell wall visible on microscopy. Legionella pneumophila is an atypical organism but it stains Gram negative rather than appearing Gram variable like Mycoplasma. Therefore, the sputum findings of a wall-less pleomorphic organism are most consistent with Mycoplasma pneumoniae as the etiologic agent. Mycoplasma is a common cause of atypical pneumonia in adults less than 40 years old.D: Mycoplasma pneumonia 