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 on skin are 
Select and explain. 
A. 10'- 102, B. 102- 105, C. 105- 010, D. >1010
D: >1010
Answer: D: >1010 
Explanation: Ans. is 'd' i.e., >1010 It has been calculated that a human adult has about 1012 bacteria on the skin.