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
In random sampling, the chance of being picked up is - 
Select and explain. 
A. Same and known, B. Not same and not known, C. Same and not known, D. Not same but known
A: Same and known
Answer: A: Same and known 
Explanation: None