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: Dental
A 5-year-old residential school child walks in to your clinic with the habit of thumb sucking in association with bruxism
Usually sucking digit will be having 
Select and explain. 
A. Fibrous roughened callus, B. Laceration of digit, C. Cut wound on digit, D. Long finger balls
A: Fibrous roughened callus
Answer: A: Fibrous roughened callus 
Explanation: None