What are the five Fs of indirect transmission?

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Step-by-step explanation:

1. The mnemonic “Five Fs” refers to the common indirect (fecal–oral) transmission routes: fingers, flies, fomites, food and fecal material/fluids. These are the $5$ key vehicles that carry pathogens from feces to a new host.
2. Compare the options:
   - (1) Flies, fingers, fomites, food and fluid — includes four canonical items (flies, fingers, fomites, food) and "fluid" as the surrogate for fecal material/fluids.
   - (2), (3), (4) each replace one of the canonical items with incorrect terms (fruit, flu, friends, etc.).
3. Option (1) is the best match to the standard Five Fs list (with “fluid” representing fecal/contaminated fluids), so it is the correct choice.

FINAL_ANSWER: a

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