Which among the following is not true about ankylosing spondylitis?

Ans.B. More common in FemalesAnkylosing spondylitis is more common in males.(M:F is between 2:1 to 3:1).There is preferential involvement of entheses ( Site of attachment of ligament or tendon to the bone).TNF a plays a major role in immunopathogenesis.Sacroiliitis is often the first manifestation of ankylosing spondylitis. Synovitis, pannus, subchondral granulation tissue and marrow edema, enthesitis and chondroid differentiation are also found.