<prompt> Answer this question truthfullyWhat is dactylitis and what causes it?  <response>: <reason> Seronegative arthropathies Bone infarctsGonococcal arthritis Juvenile chronic arthritis Leprosy Mycobacterium marinum Mycobacterium tuberculosis Psoriasis Psoriatic arthritis Reiters syndrome Sarcoiditis Sarcoidosis Sickle cell anaemia Treponema pallidum 