The text of the lesson has been corrected to "riais" but one question is still showing "riáis" as an option [and not showing "riais."]
The question is "Es saludable que [sonráis] a menudo."
I suppose you mean that it shows "sonriáis" as an option, but that's correct because it has two syllables. The change in spelling introduced by the RAE only affected the verb reír.
However, there is one example which is still wrong - "No os riáis tanto."
Gracias Alan. Ejemplo corregido.
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