This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy of skin, Subject name: Dental
True about Merkel cells 
Select and explain. 
A. Slow adapting Touch receptors, B. Located in Stratum Basale, C. Derived from Ectoderm, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Merkel cells They are slow-adapting mechanoreceptors found in fingeips, lips, oral cavity, and hair follicle. 1) Found in stratum basale; communicate with neurons 2) CK20+ in perinuclear dot pattern sensitive/ specific for Merkel cells; also (+) for neurofilaments, S100, synaptophysin, chromogranin A, vasoactive intestinal peptide, neuron-specific enolase, and calcitonin gene-related peptide. 3) are derived from Ectoderm. Ref:- Review of Dermatology by Alikhan; pg num:-6