This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Osteology, Subject name: Anatomy
[{'content': "Example for Sesamoid bone is:- \nSelect and explain. \nA. Rider's bone in adductor magnus, B. Pisiform in flexor carpi ulnaris., C. Fabella in medial head of gastrocnemius, D. One bone in peronius teius", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Sesamoid bone develops in tendon of muscles which are subjected to friction during the movements. These bones ossify after bih and act as pulleys. These bones are devoid of periosteum and lamellae. Examples are; 1) Patella in quadriceps femoris, 2) Pisiformis in flexor carpi ulnaris 3) Fabella in lateral head of gastrocnemius 4) Rider`s bone in adductor longus 5) Some unnamed bones in flexor hallucis brevis & peroneus longus.', 'role': 'assistant'}]