This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Misc., Subject name: Anatomy
All of the following are Ectodermal derivatives EXCEPT 
Select and explain. 
A. Neuron, B. Microglia, C. Lens of eye, D. Adrenal medulla
B: Microglia
Answer: B: Microglia 
Explanation: (B) Microglia # Ectoderm Derivatives:> Somatic ectoderm: Epidermis Feathers, hair, skin glands, scales Lens of eye Teeth (enamel) Mouth lining Anterior pituitary (adenohypophysis) Anal canal ADRENAL MEDULLA> Neurogenic placodes: Olfactory organ Lateral line receptors and nerves Inner ear and cranial nerve VIII Ampullary electroreceptors and nerves Taste-buds> Microglia type of glial cells originated from yolk sac derived erythromyeloid progenitors.