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': 'This phase in hair cycle determines the length to which hair in different body areas can grow – \nSelect and explain. \nA. Anagen, B. Catagen, C. Telogen, D. Kenogen', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]