Recognising Assumptions questions ask which unstated claim the argument depends on. An assumption is a required bridge between the premises and the conclusion — not just any related true fact.
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Patients who used the clinic's new follow-up app recovered more quickly than patients treated before the app existed. Both groups received the same course of medical treatment. The follow-up app is therefore speeding up patients' recovery.
Assumption to consider: The patients treated before the app existed were not recovering from more serious conditions on average. Is this an assumption on which the argument depends?