This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable Diseases, Subject name: Social & Preventive Medicine
Presumptive treatment of malaria in a chloroquine resistant area: 
Select and explain. 
A. Chloroquine + pyrimethamine, B. Sulphalene + pyrimethamine, C. Chloroquine + primaquine, D. Sulphalene 1000 mg
B: Sulphalene + pyrimethamine
Answer: B: Sulphalene + pyrimethamine 
Explanation: Ans. is 'b' ie sulph lene + pyrimethamine Presumptive treatment in Chloroquine resistant areaSingle dose of 25 mg/kg body wt. sulfalene/sulfadoxine and 1.25 mg/kg body wt. Pyrimethamine combination and thereafter tab. Primaquine 0.75 mg/kg body wt.