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
Lines of Blaschko's are related to ? 
Select and explain. 
A. Keratinocytes, B. Blood vessels, C. Nerves, D. Bones
A: Keratinocytes
Answer: A: Keratinocytes 
Explanation: Ans. is 'a' i.e., Keratinocytes Blaschko's lines correspond to the pathways followed by keratinocytes migrating from neural crest during embryogenesis. The lines follow a V-shape over spine, an S-shape on abdomen, inveed U-shape from breast area to upper arm and perpendicular down the front and back of the lower extrimities. A number of inflammatory conditions can follow Blaschko's lines - Lichen striatus Linear lichen planus. Inflammatory linear verrucous epidermal naevus (ILVEN). Blaschko dermatitis (Blaschtitis). Incontinentia pigmenti. Goltz syndrome. Linear morphoea. Segmental vitiligo. Focal dermal hypoplasia. CHILD syndrome. Hypomelanosis of Ito. Linear cutaneous lupus erythematosus