This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lower limb, Subject name: Anatomy
[{'content': "Rider's bone ossify in the \nSelect and explain. \nA. Adductor Longus, B. Gluteus Maximus, C. Lateral head of Gastronemius, D. Tibialis Posterior", 'role': 'user'}, {'content': "Answer: A \nExplanation: In horse riders, the rounded tendon of adductor longus frequently gets calcified as a result of its friction together with the horseback. This calcified tendon is named rider's bone.Reference: Chaurasia Volume II; 7th edition; Page no: 41", 'role': 'assistant'}]