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: Social & Preventive Medicine
Dukoral is: 
Select and explain. 
A. Oral cholera vaccine, B. Oral rotavirus vaccine, C. Oral typhoid vaccine, D. Ready to use therapeutic food
A: Oral cholera vaccine
Answer: A: Oral cholera vaccine 
Explanation: Dukoral is a monovalent cholera vaccine based on formalin and heat killed whole cells of vibrio cholerae 01 plus recombinant cholera toxin B subunit. Ref: Park 21st edition, page 211.