The organ A which is located inside the skull of our body is protected by a bony box B and it is surrounded by 3 membranes C. The space between the membranes is filled with liquid D which protects the organ A from mechanical shock. The organ A in combination with another organ E makes up the central nervous system.
i] What is organ A?
ii] What are B, C and D?
iii] Name the organ E.
iv] If we step out from a dark room into bright sunlight, we close our eyes for a moment. Which of the two organs A or E is directly involved in this sunshine?

Explanation

i] A - brain
ii] B - cranium, C - meninges D - cerebrospinal fluid
iii] E - spinal cord
iv] Brain