uk-dgm MCQ (SBA): NSAID Avoidance in CKD

An 80-year-old woman on the orthogeriatric ward has undergone a dynamic hip screw fixation for an intertrochanteric fracture. She is on day 2 post-operatively and is reluctant to mobilise due to pain. She is taking Paracetamol 1 g QDS but reports pain scores of 7/10 on movement. She has CKD stage 3b (eGFR 32 mL/min/1.73m²). Which analgesic should be AVOIDED in this patient?