This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: NEET Jan 2020, Subject name: Surgery
[{'content': 'What is the most probable cause of this condition? \nSelect and explain. \nA. Chronic lymphedema, B. Chronic aerial blockage, C. Chronic venous blockage, D. Chronic venous insufficiency', 'role': 'user'}, {'content': 'Answer: A \nExplanation: In the given image :- Buffalo hump, squaring of toes :- chronic lymphedema Unlike other types of oedema,lymphedema characteristically involves the foot.The contour of the ankle is lost through infilling of the submalleolar depressions,a "buffalo hump" forms on the dorsum of the foot,the toes appear"square" because of confinement of footwear and the skin on the dorsum of the toes cannot be pinched because of subcutaneous fibrosis(Stemmer\'s sign)', 'role': 'assistant'}]