medium · LSAT Logical Reasoning

Which one of the following, if true, most helps to explain why the infection rate failed to decline?

1. The far more frequent washing dried and cracked the staff's skin, and those micro-cracks harbored more bacteria than intact skin does.
2. The specialized antibacterial soap chosen for the new protocol cost noticeably more per liter than the ordinary brand the hospital had used before.
3. Patient satisfaction surveys taken in the weeks after the protocol began showed unusually strong approval of overall visible staff cleanliness.
4. Several other comparable hospitals in the region that had staff wash their hands far less often nonetheless reported lower infection rates.
5. The relentless constant washing eventually left the staff's hands so badly damaged that no patient could be safely treated by them at all.

Sign up free to see the explanation and track your rank →