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
Bakers cyst is a type of - 
Select and explain. 
A. Pulsion diveiculum of knee joint, B. Retention cyst, C. Bursistis, D. Benign tumor
A: Pulsion diveiculum of knee joint
Answer: A: Pulsion diveiculum of knee joint 
Explanation: *It is the pulsion diveiculum of the knee joint, caused by chronic disease in the joint. *Bulging of the posterior capsule and synol herniation may produce a swelling in the popliteal fossa. *It fluctuates but is not tender. REF:Apley's 9th/e p.578-9