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
Rule of Haase is used to calculate? 
Select and explain. 
A. Age of fetus, B. Length of femur, C. Diameter of skull, D. Percentage of burns
A: Age of fetus
Answer: A: Age of fetus 
Explanation: Ans. is 'a' i.e., Age of fetus