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: Social & Preventive Medicine
Pearl Index of SAHEIL 
Select and explain. 
A. 2/HWY, B. 14/HWY, C. 0.1/HWY, D. 9/HWY
A: 2/HWY
Answer: A: 2/HWY 
Explanation: None