The breast lesion shown here grossly was palpable in the upper outer quadrant of a 28 year old female. The lesion was firm, rubbery, and movable. No axillary lymph nodes were palpable. Mammography confirmed the presence of the lesion, which had no microcalcifications, and revealed no lesions of the opposite breast. The best diagnosis is:

A Phyllodes tumor

B Lobular carcinoma in situ

C Fibroadenoma

D Paget's disease of breast

E Infiltrating ductal carcinoma

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