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
Which of the following causes traveller&;s diarrhoea 
Select and explain. 
A. ETEC, B. EHEC, C. EIEC, D. EPEC
A: ETEC
Answer: A: ETEC 
Explanation: ETEC: Diarrhea caused by ETEC is of two epidemiological types. Endemic in developing countries mild watery diarrhea to fatal disease. 'Traveller's diarrhea' seen in persons from non-endemic areas visiting endemic areas. Ref: Textbook of microbiology; Ananthanarayan and paniker's; 10th Edition; Pg:285