Name the longest phase of menstrual cycle.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Menstrual Cycle**: The menstrual cycle is a monthly cycle in human females that involves various physiological changes, including vaginal bleeding.

2. **Phases of the Menstrual Cycle**: The menstrual cycle is divided into four main phases:
- **Menses Phase**: Lasts from day 0 to day 4, characterized by vaginal bleeding.
- **Follicular Phase**: Lasts from day 4 to day 10, during which follicles develop and produce ova.
- **Ovulation Phase**: Occurs around day 14, when the ovum is released, and the chances of fertilization are highest.
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