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a
Phloem parenchyma and RBCs
b
Virus and sieve tube cell
c
Viroid and sieve tube cell
d
Mature RBCs and sieve tube cells
answer is D.
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Detailed Solution
Nucleus is absent in mature sieve tube cell and mature RBCs. Viroid and viroids do not have nucleus but they are acellular particles. Phloem parenchyma contains nucleus.