Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) androgenetic alopecia ?
    ### Response:
    Androgenetic alopecia is a common form of hair loss in both men and women. In men, this condition is also known as male-pattern baldness. Hair is lost in a well-defined pattern, beginning above both temples. Over time, the hairline recedes to form a characteristic "M" shape.
    