A) If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B) If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C) If the assertion is true but the reason is false
D) If both the assertion and reason are false
E) If the assertion is false but reason is true
Correct Answer: B
Solution :
A small, glandular, blind pouch of lymphatic tissue, the bursa lies on the dorsal side of the cloaca, it is lined with endoderm, and opens into the proctodaeum. In a young bird, it forms lymphocytes, and probably it produces antibodies and protects against local infection, but it atrophies in the adult before sexual maturity. It is also called cloacal, thymus like thymus, it secretes lyphocytes.
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