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: Microbiology
The number of bacteria per cm of skin are ? 
Select and explain. 
A. 10'- 102, B. 102- 103, C. 105- 1010, D. >10'
B: 102- 103
Answer: B: 102- 103 
Explanation: Ans. is `b' i.e., 102- 103 Density of bacterial population at most sites is between 100-1000 per square cm.