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: Medicine
Which of the following cause dysentery-a) Giardiasisb) Entaemoeba histolyticac) Balantidium colid) Cyclosporiasis 
Select and explain. 
A. ac, B. bc, C. c, D. d
B: bc
Answer: B: bc 
Explanation: None