Q: In this task, you are given a question and answer options for that question. Using this information, you have to classify each text into different topics: medicine, nursery, psychology, chemistry, pharmacology, biology.
Question: What is the most important prognostic factor in Stage 1 Melanoma?
Options: <0> Serum LDH level. <1> Tumor thickness measured in the Breslow index. <2> The presence of clinical or histological ulceration. <3> Number of metastases. <4> The mitotic index. The mitotic index.
A:
medicine