## **Core Concept**
The classic triad of ectopic pregnancy consists of abdominal pain, amenorrhea, and vaginal bleeding. Ectopic pregnancy occurs when a fertilized egg implants outside the uterus, most commonly in the fallopian tubes.

## **Why the Correct Answer is Right**
The classic triad of symptoms associated with ectopic pregnancy includes:
- Abdominal pain: Often sharp and stabbing, usually located on one side of the lower abdomen.
- Amenorrhea: The absence of menstruation, which can be due to the pregnancy itself.
- Vaginal bleeding: Light to heavy vaginal bleeding.

## **Why Each Wrong Option is Incorrect**
- **Option A:** Abdominal pain is a key component of the classic triad.
- **Option B:** Amenorrhea is also a component of the classic triad.
- **Option D:** Vaginal bleeding is the third component of the classic triad.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that not all patients with ectopic pregnancy present with the classic triad, and the absence of one or more of these symptoms does not rule out ectopic pregnancy. Additionally, the presence of a palpable adnexal mass and a positive pregnancy test can support the diagnosis.

**Correct Answer:** . Shock.