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Given a scientific passage and an answer, generate a question for the given answer.

Passage: The retina is a membrane lining the back of the eye. The retina has nerve cells called rods and cones that change images to electrical signals. Rods are good at sensing dim light but can't distinguish different colors of light. Cones can sense colors but not dim light. There are three different types of cones. Each type senses one of the three primary colors of light (red, green, or blue). Answer: retina
Output:
What do you call the membrane lining the back of the eye?