**Core Concept**
Zinc is an essential trace element that plays a crucial role in various bodily functions, including growth and development, immune function, and reproductive health. Its deficiency can lead to a range of clinical manifestations, primarily affecting growth, development, and immune function.

**Why the Correct Answer is Right**
Zinc deficiency can indeed cause growth retardation due to impaired protein synthesis and cell division. It also contributes to sexual infantilism in children, as zinc is essential for the development and maturation of reproductive organs. Additionally, zinc deficiency can lead to alopecia, characterized by hair loss, due to the disruption of hair growth and maintenance processes. Therefore, all the options listed (A, B, and C) are potential consequences of zinc deficiency.

**Why Each Wrong Option is Incorrect**
* **Option A:** Growth retardation is a well-documented effect of zinc deficiency, making it an incorrect choice.
* **Option B:** Sexual infantilism is also a recognized consequence of zinc deficiency, particularly in children, making it an incorrect choice.
* **Option C:** Alopecia is another potential outcome of zinc deficiency, affecting hair growth and maintenance, making it an incorrect choice.

**Clinical Pearl / High-Yield Fact**
Zinc deficiency can be exacerbated by excessive intake of phytates, oxalates, and other compounds that inhibit zinc absorption.

**✓ Correct Answer: D. None**