This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
Fixity of the breast tissue in carcinoma of breast indicates infiltration of 
Select and explain. 
A. Suspensory ligaments, B. Lymphatics, C. Pectoralis muscle and fascia, D. Internal mammary aery
C: Pectoralis muscle and fascia
Answer: C: Pectoralis muscle and fascia 
Explanation: Answer- C. Pectoralis muscle and fasciaFixity of the breast tissue is tested by asking the patient to press the hand against the hip forcibly to contract Pectoralis major muscle & moves the breast over the pectoralis fascia in the direction of muscle frbres of the pectorals major muscle.Loss of normal mobility or fixity of the breast tissue indicates spread of cancer cells to underlying pectoralis muscle and fascia.