A technician examines a patient's faeces and finds worms with flattened, segmented bodies. What are they?

1. The two clues are flattened and segmented, and both must hold. 2. Tapeworms are flatworms whose bodies are divided into a chain of segments, so they match both. 3. Roundworms and filarial worms are round in cross-section and tapered at both ends, not flattened. 4. Liver flukes are flattened from back to front but are not segmented. 5. Planaria are flatworms too, but they are free-living in water rather than parasites found in faeces. _Source: NECTA CSEE 2021 Biology 033, Question 1: Multiple Choice, item (viii)_