Unknown Which is seen more commonly in rheumatoid arthritis than in ankylosing spondylitis? A An HLA-B27 haplotype B Sacroiliitis C Increased incidence in men D Autoantibody against IgG 💡 Explanation Which is seen more commonly in rheumatoid arthritis than in ankylosing spondylitis? ✓ Correct Answer: D. Autoantibody against IgG