Under OSHA's Hearing Conservation Amendment (29 CFR 1910.95), which finding most clearly requires referral to a physician or audiologist?
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A
A 5 dB shift at any single frequency from baseline
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B
A confirmed Standard Threshold Shift (STS) of 10 dB average at 2000, 3000, and 4000 Hz
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C
Any audiogram showing thresholds above 15 dB HL
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D
A worker complaint of ringing in the ears after a single shift