This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Women Imaging, Subject name: Radiology
20 years old female came with complaint of a palpable painless mass in right breast. On examination, mass was mobile and hard in consistency. Ultrasound of right breast was performed . Most likely diagnosis is? 
Select and explain. 
A. Breast cyst, B. Ductal papilloma, C. Fibroadenoma, D. Phylloid's tumour
C: Fibroadenoma
Answer: C: Fibroadenoma 
Explanation: Ultrasound shows a well-defined hypoechoic lesion seen in right breast . Given the clinical history and age of the patient, most likely diagnosis is fibroadenoma . Breast cyst is anechoic on USG.