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
Male with patchy loss of scalp hair, eyebrows & beard with grey hair 
Select and explain. 
A. Alopecia areata, B. Anagen effluvium, C. Telogen effluvium, D. Androgenic alopecia
A: Alopecia areata
Answer: A: Alopecia areata 
Explanation: 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