A 53-Year-Old Man Comes to the Physician Because of a 3-Month

A 53-year-old man comes to the physician because of a 3-month history of noproductive cough. He has also had a 4.6-kg (10-lb) weight loss over the past 6 months. He has smoked one pack of cigarettes daily for 35 years.   He recently developed left shoulder pain. Examination shows dry mucous membranes. The pupils are equal and react sluggishly to light. An x-ray of the chest shows a pulmonary nodule in the left lung. Compression of a nerve arising from which of the following locations is most likely causing this patient's recent symptoms?

A) Brainstem
B) C1-C3
C) C3-C5
D) C5-C8
E) T1-T2

Correct Answer:

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