This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Parasitology, Subject name: Microbiology
[{'content': 'In formol ether concentration technique, which layer contain the parasites? \nSelect and explain. \nA. Ether, B. Fecal debris, C. Formal water, D. Sediment', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D. Sediment. (Ref. Medical parasitology by Rajesh Karyakarte 1st ed/pg. 215; Fig. 12-2)Concentration techniques include:# Sedimentation techniques- Formol ether concentration technique- Formol detergent concentration technique# Floatation techniques- Sodium chloride floatation techniques- Zinc sulphate floatation technique- Sugar floatation techniqueFormol ether concentration technique is overall best sedimentation technique. It is rapid and gives good results. The figure shown in reference mentioned clearly shows sediment-containing parasites.', 'role': 'assistant'}]