Explanation:
The correct option is 'b'. Ceramic-on-ceramic (CoC) bearings offer excellent low wear rates but are uniquely associated with 'stripe wear' (due to microseparation and edge loading during swing phase) and a clinical phenomenon of squeaking, which occurs in 1-20% of patients.

Reference: Walter WL, et al. Squeaking in ceramic-on-ceramic hips: the importance of acetabular component orientation. J Arthroplasty. 2007;22(4):496-503.