The correct option is B Malaria
Mepacrine was initially approved in the 1930s as an antimalarial drug. It was used extensively during the second world war by US forces fighting in the Far East to prevent malaria.Paludrine is used to prevent malaria in adults and children. Non-immune subjects entering a malarious area are advised to begin daily treatment with Paludrine 1 week before. So, the correct answer is option B.