## **Core Concept**
Type II bipolar disorder, also known as **bipolar II disorder**, is a **mood disorder** characterized by a pattern of depressive episodes and **hypomanic episodes**, but not the full-blown **manic episodes** seen in Type I bipolar disorder.

## **Why the Correct Answer is Right**
The correct answer involves a combination that defines Type II bipolar disorder. This disorder is marked by the occurrence of at least one **major depressive episode** and at least one **hypomanic episode**. The absence of full **manic episodes** distinguishes it from Type I. The diagnostic criteria according to the DSM-5 include a pattern of depressive and hypomanic episodes without the full manic episodes.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because it likely includes a full manic episode, which is characteristic of Type I bipolar disorder, not Type II.
- **Option B:** This option might not fully capture the essence of Type II, which specifically includes hypomanic episodes without the full manic episodes.
- **Option D:** This option could be incorrect if it suggests the presence of elements not typical for Type II bipolar disorder, such as full manic episodes.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that patients with **bipolar II disorder** are at a higher risk of **suicide** and often present initially with **depression**, making the diagnosis challenging if only focusing on mood episodes without considering the full spectrum of bipolar disorders.

## **Correct Answer:** .