Final answer:
In a client with type 1 diabetes mellitus, erythema and edema at the base of the left great toe require immediate nursing intervention to prevent complications.
Explanation:
The finding that requires immediate intervention by the nurse is option B: Erythema and edema at the base of the left great toe. In a client with type 1 diabetes mellitus, these symptoms can indicate the presence of an infection that needs prompt attention to prevent further complications such as foot ulcers or gangrene.
Option A describes a possible bunion, Option C refers to neuropathy commonly seen in diabetic patients, and Option D outlines issues related to corns and calluses, which can be managed but are not as urgent as the symptoms described in Option B.
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