Final answer:
The subject of this question is Medicine, specifically regarding a common benign breast tumor. The answer provides an explanation of what a benign breast tumor is and how it can be diagnosed.
Step-by-step explanation:
The subject of this question is Medicine. The question is asking about a common benign breast tumor, which is a type of growth that occurs in the breast. It is usually 1-3cm in size and consists of fibrous stromal tissue and tissue clefts. For diagnosis, a fine needle aspiration (FNA) can be done.