Increased AFP level is seen in :
**Core Concept**
The alpha-fetoprotein (AFP) is a major plasma protein produced by the yolk sac and fetal liver during fetal development. Elevated levels of AFP can indicate various pathological conditions, primarily related to liver disease, cancer, or fetal anomalies.
**Why the Correct Answer is Right**
AFP is a glycoprotein that plays a crucial role in fetal development. In adults, elevated AFP levels are often associated with liver disease, especially hepatocellular carcinoma. The mechanism involves the excessive production of AFP by cancer cells in the liver, which is then released into the bloodstream. This condition is more common in individuals with chronic liver disease, such as cirrhosis, and those infected with hepatitis B or C.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided.
**Option B:** This option is not provided.
**Option C:** This option is not provided.
**Clinical Pearl / High-Yield Fact**
It is essential to note that AFP levels can also be elevated in other conditions, such as testicular cancer, germ cell tumors, and congenital anomalies like spina bifida. Therefore, a single elevated AFP level should prompt further investigation to determine the underlying cause.
**Correct Answer:** D.