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: Anatomy
In case of Blockade of 2nd pa of axillary aery blood supply to upper limb is maintained by which anastomosis - 
Select and explain. 
A. Dorsal scapular anastomosis, B. Ventral scapular anastomosis, C. Circle of Willis, D. Anastomosis around internal thoracic aery
A: Dorsal scapular anastomosis
Answer: A: Dorsal scapular anastomosis 
Explanation: Ans. is'a'i.e., Dorsal scapular anastomosis(Ref: Clinical anatomy 3d/e p. 756)Dorsal Scapular Anastomosis:This anastomosis occurs connects the 1st pa of subclan aery to the third pa of axillary aery providing an alternate route of flow of blood in case of occlusion anywhere within the subclan and axillary aery.