Nicholas is prone to sinus infections. Lately his mother has noticed he doesn't seem to hear her when she is standing behind him. Which of the following best explains Nicholas's condition?
A. Nicholas's sinus infection would not affect his hearing, and he is just ignoring his mother.
B. Fluid associated with Nicholas's infection is inhibiting movement of the auditory ossicles, resulting in conductive hearing loss.
C. Nicholas's sinus infection is compressing nerves that transmit action potentials from the ear to the brain.
D. Bacteria from the sinus infection have disrupted normal action potential propagation, causing damage to the spiral organ.
Answer: B
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