This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
Type of diarrhea in Vibrio cholera is 
Select and explain. 
A. Osmotic, B. Secretary, C. Colloidal, D. Bloody
B: Secretary
Answer: B: Secretary 
Explanation: cholera is an acute diarrheal disease caused by V.cholera. In its most severe form, it presents as profuse painless, watery diarrhea and copious effoless vomiting; this may lead to hypovolemic shock and death. The cholera stool is typically a colorless watery fluid with flecks of mucus, said to resemble water in which rice has been washed (hence called 'rice-water stools') Ref: Textbook of microbiology; Ananthanarayan and paniker's; 10th Edition; Pg:313