<s>[INST] What is Ankylosing arthritis?  [/INST] Ankylosing arthritis is a common type of arthritis which affects the spine and joints of the hips.  Source: Mr. Med. Link: https://www.mrmed.in/health-library/rheumatology/frequently-asked-arthritis-questions. Field: Rheumatology. Disease: Arthritis </s>