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
Flat was is caused by which HP types: 
Select and explain. 
A. 2, 4, B. 3,10, C. 16,18, D. 5, 8
B: 3,10
Answer: B: 3,10 
Explanation: Ans. b. 3, 10