The abbreviation "O.S." in a prescription refers to:
a. right eye. c. left eye.
b. left ear. d. right arm.
ANS: C
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A Incorrect: This abbreviation for right eye is O.D.
B Incorrect: There is no abbreviation for left ear.
C Correct: O.S. is the abbreviation for left eye.
D Incorrect: There is not abbreviation for right arm.
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