This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Orthopaedics
All are true regarding Anklosing spondylitis except - 
Select and explain. 
A. Sacroilitis, B. HLA -B27, C. Iridocyclitis, D. More common in females
D: More common in females
Answer: D: More common in females 
Explanation: Ankylosing spondylitis is more common in males (not females).