Lysine is deficient in-
**Core Concept**
Lysine is an essential amino acid that plays a crucial role in various bodily functions, including protein synthesis, immune function, and collagen production. It is one of the 20 amino acids that make up proteins, and its deficiency can lead to various health issues.
**Why the Correct Answer is Right**
Lysine is an essential amino acid, which means it cannot be synthesized by the human body and must be obtained through dietary sources. A diet lacking in lysine can lead to a deficiency, which is often seen in individuals with celiac disease, Crohn's disease, or those following a vegan diet. Lysine deficiency can cause a range of symptoms, including fatigue, weakness, and an increased risk of infections.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because lysine is not specifically deficient in this condition. While it may be affected, it is not the primary deficiency associated with this condition.
**Option B:** This option is incorrect because lysine is not specifically deficient in this condition. In fact, lysine supplementation is often used to treat this condition, as it can help alleviate symptoms.
**Clinical Pearl / High-Yield Fact**
It's essential to note that lysine deficiency can be a concern in individuals with celiac disease or those following a vegan diet, as these groups often have limited access to dietary sources of lysine.
**Correct Answer: D. Beriberi**