**Core Concept**
The question tests the understanding of common gynecological conditions presenting with dysmenorrhea and menorrhagia, which are **painful menstruation** and **heavy menstrual bleeding**, respectively. These symptoms can be associated with various conditions, including **hormonal imbalances**, **anatomical abnormalities**, and **neoplastic processes**.

**Why the Correct Answer is Right**
The correct answer is likely **c) Fibroid**, as **uterine fibroids** are a common cause of both dysmenorrhea and menorrhagia in women of reproductive age. Fibroids can lead to **heavy bleeding** due to their location and size, and they can also cause **pain** by stimulating uterine contractions.

**Why Each Wrong Option is Incorrect**
**Option A:** DUB (Dysfunctional Uterine Bleeding) is a condition characterized by abnormal uterine bleeding without an identifiable cause, but it is less likely to cause dysmenorrhea.
**Option B:** Endometriosis is a condition where tissue similar to the lining of the uterus grows outside the uterus, leading to pain, but it is not the most common cause of both symptoms together.
**Option D:** Endometrial Ca (Endometrial Cancer) is a rare condition in a 45-year-old woman without other risk factors and is less likely to present with these symptoms alone.

**Clinical Pearl / High-Yield Fact**
Uterine fibroids are a common cause of menorrhagia and dysmenorrhea in women of reproductive age, and their diagnosis can be confirmed by **ultrasound** or **MRI**.

**Correct Answer:** C. Fibroid