This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Other Rheumatic Diseases, Subject name: Orthopaedics
Sausage digits is seen in - 
Select and explain. 
A. Lyme arthritis, B. Osteoarthritis, C. Psoriatic arthritis, D. None
C: Psoriatic arthritis
Answer: C: Psoriatic arthritis 
Explanation: Ans. is 'c' i.e., Psoriatic arthritis o Sausage digit refers to diffuse fusiform swelling of the digit due to soft tissue inflammation from underlying arthritis or dactylitis,o Causes are :-Psoriatic arthritisOsteomyelitisSickle cell anemiaSarcoidosisTubercular dactylitis (spina ventosa)