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-   -   Repeated USMLE Questions Step 1-545 (https://www.usmle-forums.com/usmle-step-1-forum/622755-repeated-usmle-questions-step-1-545-a.html)

sohag100 02-02-2019 09:25 PM

Repeated USMLE Questions Step 1-545
 
A 23-year-old woman presents to her physician with ptosis, meiosis and anhidrosis in the left eye.
Which one of the following drugs is used to determine whether this lesion is preganglionic or postganglionic?
A-Albuterol
B-Atenolol
C-Cocaine
D-Epinephrine
E-Phenylephrine
Answer


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