**Core Concept**
Kwashiorkor is a form of severe malnutrition characterized by inadequate protein intake, leading to edema, muscle wasting, and impaired growth and development. It is often associated with marasmus, another form of malnutrition, but can be distinguished by specific clinical features.

**Why the Correct Answer is Right**
The most specific clinical feature for diagnosis of Kwashiorkor is edema, particularly peripheral edema. This is due to the impaired synthesis of albumin, a protein that plays a crucial role in maintaining blood volume and preventing fluid leakage into tissues. The liver's inability to produce albumin leads to a decrease in oncotic pressure, causing fluid to shift from blood vessels to interstitial spaces, resulting in edema. The presence of edema is a key distinguishing feature between Kwashiorkor and marasmus, which is characterized by muscle wasting without edema.

**Why Each Wrong Option is Incorrect**
**Option A:** Hypoglycemia is a common feature in both Kwashiorkor and marasmus, as a result of impaired glucose metabolism and decreased glycogen stores. It is not a specific feature for diagnosis of Kwashiorkor.
**Option B:** Muscle wasting is a feature of marasmus, but not a specific feature for diagnosis of Kwashiorkor.
**Option C:** Anemia is a feature of both Kwashiorkor and marasmus, due to impaired iron absorption and decreased erythropoiesis. It is not a specific feature for diagnosis of Kwashiorkor.

**Clinical Pearl / High-Yield Fact**
Remember the "3 Cs" of malnutrition: **Cachexia (marasmus)**, **Cachexia with edema (Kwashiorkor)**, and **Cachexia with edema and dermatitis (Kwashiorkor with skin lesions)**.

**Correct Answer:** C. Edema.