This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Alopecia, Subject name: Skin
Non scarring loss of hair - 
Select and explain. 
A. Alopeciaareata, B. Lichenplanus, C. SLE, D. Dissecting folliculitis
A: Alopeciaareata
Answer: A: Alopeciaareata 
Explanation: Ans. is 'a' i.e.. Alopecia areata Causes of cicatricial alopeciaPrimary' Cutaneous disordersSystemic disorderso Cutaneous lupus (DLE)o SLEo Lichen planuso Sarcoidosiso Folliculitis decalvanso Cutaneous metastasiso Linear scleroderma (morphea) o Lupus vulgaris o Leprosy o Injury, bum, radiation o Central centrifugal cicatricial alopecia Causes of non-cicatricial alopeciaPrimary Cutaneous disordersSystemic disordersDrugsTelogen effluviumSLEWarfarinAnagen effluviumSecondary' syphiilisHeparinTinea capitisHypothyroidismVit-AAlopecia areataHyperthyroidismPropylthiouracilTraumatic alopecia (trichotelomania)HypopitutarismLithiumAndrogenic alopeciaDefici ency of protein, Fe, Zn, BiotinBeta blockersColchicinesAmphetamines