Detailed Instructions: In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.
Problem:Question: In the presence of a patient with suspected blistering pemphigoid, which of the following tests should we perform to confirm the diagnosis?
Options: <1> Dermatoscopy. <2> Cultivation of the contents of a blister. <3> Skin biopsy for culture. <4> Skin biopsy for histological study and direct immunofluorescence. <5> Analytical with determination of antinuclear and anti DNA antibodies.
Solution:
4