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: Dental
[{'content': 'A reliable indicator of pubertal growth spurt on hand\nwrist films is sought as: \nSelect and explain. \nA. Ossification of adductor sessamoid, B. Appearance of hook of hamate, C. Ossification of all the carpal bones, D. Ossification of pisiform', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]