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: Pathology
Antitopoismerase I is mark of- 
Select and explain. 
A. Systemic sclerosis, B. Classic Polyaeritis nodosa, C. Nephrotic syndrome, D. Rheumatoid ahritis
A: Systemic sclerosis
Answer: A: Systemic sclerosis 
Explanation: Ans. is 'a' i.e., Systemic sclerosis