Programmed cell death (PCD) is a tightly regulated process that is important in the growth and development of plants. In plants there are several tissues which become functional after undergoing PCD. Which of the following cells/tissues represent "functional corpses" arising due to PCD in plants?
(i) Cork cells in bark.
(ii) Sieve elements of phloem.
(iii) Companion cells of phloem.
(iv) Tracheary elements of xylem.

• A

  (i) and (ii) only.
• B

  (ii), (iii) and (iv) only.
• C

  (i) only.
• Correct answer
  D

  (i) and (iv) only.

Hence, the correct answer is option: 'D'.