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: D
Solution :
Lacunae are actually the flat irregular spaces occurring in the solid matrix of bone. Each lacuna lodges a flat bone cell or osteocyte. Compact bone possesses many parallel, longitudinal column like structures called haversian systems, in which several concentric layers of bony matrix called lamellae encircle a longitudinal central canal called haversian canal. It is the Haversian canal, which carries blood vessels and nerves to the bone. Lacunae containing osteocytes occur in a layer between two lamellae.
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