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
Estimated mean Hemoglobin (Hb) of 100 women is 10 g%. Standard deviation (σ) is 1gm %. Standard error of estimate will be – 
Select and explain. 
A. 0.001, B. 1, C. 10, D. 0.1
D: 0.1
Answer: D: 0.1 
Explanation: None