This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disorders of hair, Subject name: Dental
[{'content': 'Male with patchy loss of scalp hair, eyebrows & beard with grey hair \nSelect and explain. \nA. Alopecia areata, B. Anagen effluvium, C. Telogen effluvium, D. Androgenic alopecia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Patchy loss, exclamation mark hair, autoimmune - Alopecia areata Alopecia areata is the commonest cause of patchy alopecia. Loss of Hair following a stress, infection etc - Telogen effluvium Loss of hair after Chemotherapy - Anagen effluvium Frontotemporal Recession - Androgenetic alopecia', 'role': 'assistant'}]