This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Misc., Subject name: Microbiology
The number of bacteria on skin are - 
Select and explain. 
A. 10l- 102, B. 102- 105, C. 105-1010, 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, 1010 in the mouth and 1014 in thegastrointestinal tract. ---------Textbook of bacteriology