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: Forensic Medicine
Callus becomes thick and hard like bone within 
Select and explain. 
A. 2 weeks, B. 4 weeks, C. 6 weeks, D. 3 months
D: 3 months
Answer: D: 3 months 
Explanation: D i.e. 3 months