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
[{'content': '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 up a person requiring surgery \nSelect and explain. \nA. 2\\/6, B. 3\\/5, C. 1\\/2, D. 6\\/25', 'role': 'user'}, {'content': 'Answer: A \nExplanation: <p> 2/6. Reference:Text of preventive and social medicine,K.Park,20th edition,page no:755. <\\p>', 'role': 'assistant'}]