A 49-year-old male presents with symptoms that developed following a long weekend of binge drinking. His serum reveals a g-glutamyl transferase (GGT) level of 65 IU/L. A liver biopsy reveals fatty change (steatosis) of numerous hepatocytes. This patient’s liver abnormality is most likely the result of

**Core Concept**
The patient's presentation with elevated serum GGT levels and fatty change (steatosis) of hepatocytes following binge drinking suggests alcoholic liver disease (ALD), which is a spectrum of liver damage caused by excessive alcohol consumption.

**Why the Correct Answer is Right**
The mechanism underlying ALD involves the metabolism of ethanol by alcohol dehydrogenase (ADH) to acetaldehyde, which is then converted to acetate by aldehyde dehydrogenase (ALDH). The accumulation of acetate leads to an increase in the NADH/NAD+ ratio, promoting the conversion of fatty acids to triglycerides and ultimately resulting in steatosis. The elevated GGT levels are indicative of cholestasis and oxidative stress, which are also consequences of chronic alcohol consumption.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because non-alcoholic steatohepatitis (NASH) typically presents with more severe inflammation and fibrosis, and is not directly related to the patient's history of binge drinking.

**Option B:** This option is incorrect because primary biliary cirrhosis is a chronic cholestatic liver disease characterized by the progressive destruction of intrahepatic bile ducts, which is not consistent with the patient's presentation.

**Option C:** This option is incorrect because primary sclerosing cholangitis is a chronic inflammatory disease of the bile ducts, which is not directly related to the patient's history of binge drinking.

**Clinical Pearl / High-Yield Fact**
It's essential to note that the diagnosis of ALD often requires a combination of clinical history, laboratory findings (e.g., elevated GGT levels), and histological evidence of liver damage. A high index of suspicion and a thorough evaluation of the patient's drinking habits and medical history are crucial in making the correct diagnosis.

**Correct Answer: D. Alcoholic liver disease**

✓ Correct Answer: D. Increased NADH production