Patient is a 65-year old woman presenting with a 2-week cough and shortness of breath. The patient was seen 5 weeks ago for temporal arteritis, a syndrome that can lead to blindness, and was prescribed corticosteroids. Sometimes the cough is productive, with green sputum. Low- grade fever is present.The patient has adult-onset diabetes mellitus and hypertension. Crackles are present in the right upper lobe of her lung. Gram stain of sputum shows branching, slender, gram-positive rods. Which of the following is the most likely pathogen? Pseudomonas aeruginosa Nocardia asteroides Bacteriodes melaninogenicus Haemophilis influenzae.