This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy of skin, Subject name: Dental
[{'content': 'Growth phase of hair is- \nSelect and explain. \nA. Anagen, B. Metagen, C. Telogen, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Anagen phase- active growth phase - 2-10years duration Catagen phase- regression phase- 3 weeks duration Telogen phase- resting phase- 3 months duration Ref Harrison20th edition pg 1234', 'role': 'assistant'}]