**Core Concept**
The Child-Pugh score is a system used to assess the prognosis of patients with cirrhosis. It takes into account five clinical features: albumin levels, bilirubin levels, prothrombin time (or INR), ascites, and encephalopathy. The score is used to categorize patients into three stages: A, B, or C, with stage C indicating the most severe liver dysfunction.

**Why the Correct Answer is Right**
Child's B is characterized by a score of 5-6. This stage indicates moderate liver dysfunction, with a higher risk of complications such as variceal bleeding and spontaneous bacterial peritonitis. Patients with this stage of cirrhosis may also experience significant fatigue, muscle wasting, and jaundice. The key features of Child's B include an albumin level of 1.5-2.5 g/dL, a bilirubin level of 2.3-3.0 mg/dL, a prothrombin time of 2-3 seconds longer than normal, and the presence of ascites.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because Child's A is characterized by a score of 5 or less, indicating mild liver dysfunction. Child's B has a score of 5-6.
**Option B:** This option is incorrect because Child's C is characterized by a score of 7-9, indicating severe liver dysfunction. Child's B has a score of 5-6.
**Option D:** This option is incorrect because Child's B is not characterized by a score of 10 or more. The Child-Pugh score ranges from 5 to 15.

**Clinical Pearl / High-Yield Fact**
Remember that the Child-Pugh score is a clinical tool used to assess prognosis and guide treatment decisions in patients with cirrhosis. It is not a direct measure of liver function, but rather a composite score that takes into account multiple clinical features.

**Correct Answer: C. A score of 5-6.**