In which organ corpus luteum is formed?

Explanation

**Step-by-Step Solution:**

1. **Understanding Corpus Luteum**: The corpus luteum is a structure that forms in the ovary after an ovum (egg) has been released during ovulation. It is derived from the follicle that contained the egg.

2. **Formation Process**: After ovulation, the ruptured follicle transforms into the corpus luteum. This transformation is essential for the reproductive cycle.

3. **Hormonal Role**: The corpus luteum secretes the hormone progesterone, which plays a crucial role in preparing the endometrium (the lining of the uterus) for a potential pregnancy.

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