<prompt> True about Cholera -a Food can transmit cholerab Vaccination gives 90 efficiencyc Healthy carrier can transmit cholerad Chlorination is not effectiveacbcadb  <response>: Cholera is transmitted by contaminated water food, direct contact through finger from carriersAbout Other Options:Option b: Vaccination gives protection rate of 5060 ... Ananthanarayan 9e p311Option d: Chlorination is effective. In rural area, water can be made safe from cholera bacilli by boiling or chlorination 