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: Skin
The Hamilton Norwood scale is used for: 
Select and explain. 
A. Male androgenetic alopecia, B. Female androgenetic alopecia, C. Alopecia areata, D. Telogen effluvium
A: Male androgenetic alopecia
Answer: A: Male androgenetic alopecia 
Explanation: Ludwig scale is used in female pattern hair loss. The most common pattern of hair loss seen in women is diffuse reduction of hair density over the crown, so-called Christmas-tree pattern, with widening of the central paing line. Ref: Rook's textbook of dermatology, Edition-8, Page-66.18.