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
Which of the following is the characteristic feature of systemic sclerosis: 
Select and explain. 
A. Increased calcium in tissues., B. Increased collagen in tissues., C. Increased GAG in tissues., D. None.
B: Increased collagen in tissues.
Answer: B: Increased collagen in tissues. 
Explanation: None