A laboratory reported seeing unusually large Trichuris sp. eggs during routine examinations of fecal specimens collected from children in a daycare setting.  The eggs consistently measured 72 to 90 µm by 32 to 40 µm and were more barrel-shaped than normally seen for Trichuris trichiura.  What is your diagnosis?

(a) These are aberrant eggs of T. trichiura collected after treatment with antihelminthics
(b) These are eggs of T. vulpis, the dog whipworm
(c) These are eggs of T. trichiura that have been centrifuged at an abnormally high speed
(d) These are not eggs of Trichuris, but are eggs from a plant nematode