This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemotherapy, Subject name: Pharmacology
Drug of choice for treatment of malaria due to P. Vivax in a 25 year old pregnant female is 
Select and explain. 
A. Chloroquine, B. Primaquine2, C. Sulfadoxine -pyrimethanone, D. Quinine
A: Chloroquine
Answer: A: Chloroquine 
Explanation: Refer KDT 6/e 786 DOC for malaria in pregnant -chloroquine DOC for chloroquine resistant malaria in pregnant -Quinine