This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Biostatistics, Subject name: Social & Preventive Medicine
On a given day, a hospital had 50 admissions with about 20 girls and 30 boys, out of which 10 girls and 20 boys needed surgery. What is the possibility of picking ou a person requiring surgery 
Select and explain. 
A. 6-Feb, B. 5-Mar, C. 2-Jan, D. 25-Jun
B: 5-Mar
Answer: B: 5-Mar 
Explanation: P(surgery) = (those requiring surgery) / total number = 30/50 = 3/5The probability of picking boy requiring surgery would be 2/5The probability of picking girl requiring surgery would be 1/5