Polar bodies are produced during the formation of
 A. Sperm
 B. Oogonium
 C. Spermatocytes
 D. Secondary oocyte

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Hint: They are the immature egg shortly after ovulation, until fertilization, where it becomes an ootid. They are the largest cell in the body, and in humans, it can be seen by the naked eye.

Complete answer: During the development of the fetus, numerous oogonia are produced which undergo mitosis and form primary oocytes which remain in prophase of meiosis I throughout childhood. Primary oocytes are surrounded by a single layer of cells, the granulosa cells, and form structures called primordial follicles. In a woman's fertile years, one primordial follicle per month develops into a mature follicle, known as the Graaf's follicle. It includes a secondary oocyte and the first polar body, formed when the primary oocyte divides by meiosis I.

Additional information:
The secondary oocyte is haploid. The second meiotic division progresses to the metaphase, but does not continue until a sperm fuses with the oocyte. During fertilization, the secondary oocyte undergoes the second meiotic division producing a large cell, the ovum, and a second polar body. All polar bodies are tiny cells. Therefore, the first polar body is produced during the formation of the secondary oocyte.

So, The correct answer is “secondary oocyte”.

Note: A polar body is a small haploid cell that simultaneously forms as an egg during oogenesis, but which usually does not have the ability to be fertilized. When some diploid cells in animals undergo cytokinesis after meiosis to produce eggs, they sometimes divide unevenly. Most of the cytoplasm is secreted in a daughter cell, which develops into an egg or ovum, while the smaller polar bodies receive only a small amount of cytoplasm. They often die and decay through apoptosis, but in some cases, they remain and can be important in the body's life cycle.