This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Anatomy
[{'content': 'Crystalline lens develops from \nSelect and explain. \nA. Mesoderm, B. Endoderm, C. Surface ectoderm, D. Neuroectoderm', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The lens or crystalline lens or aquula ) has a key role in focussing light (with the cornea) upon the neural retina. The lens embryonic origin is from surface ectoderm of the sensory placodes that form in the head region . The lens focusses by refracting light as it passes through the biconvex lens, which can be altered in shape (accommodation) by surrounding ciliary muscles. These ciliary muscles are activated (contracted) by parasympathetic innervation from the ciliary ganglion itself innervated by the oculomotor nerve . Ref - <a href="', 'role': 'assistant'}]