A size 16 Mustad C53S or Tiemco 200R (same style, different makers). Ties dandy dries, nymphs, emergers and terrestrials. Can make extended bodies or larger dries, articulated nymph for bigger sub-surface nymphing, yet small enough for more finicky eaters we sometimes find.

I'd hate to find myself with only one hook, either by style or size but you asked.