Deficiency of calcium causes ______

Options

A. rickets
B. anaemia
C. goitre
D. weak bones

Explanation

**Step-by-Step Solution:**

1. **Identify the Nutrient in Question**: The question asks about the deficiency of calcium. Calcium is an essential mineral that plays a crucial role in maintaining bone health.

2. **Understand the Role of Calcium**: Calcium is vital for the development and maintenance of strong bones and teeth. It also plays a role in muscle function, nerve signaling, and blood clotting.

3. **Consider the Options Given**: The options provided are:
- Rickets
- Anemia
- Goiter
- Weak bones

4. **Analyze Each Option**:
- **Rickets**: This condition is primarily caused by a deficiency of vitamin D, not calcium directly. It leads to softening and weakening of bones in children.
- **Anemia**: This condition is related to a deficiency of iron, not calcium.
- **Goiter**: This condition is caused by a deficiency of iodine, leading to swelling in the neck.
- **Weak Bones**: A direct consequence of calcium deficiency. When there is insufficient calcium in the body, bones can become weak and more prone to fractures.

5. **Conclusion**: Based on the analysis, the deficiency of calcium primarily causes weak bones.

**Final Answer**: Deficiency of calcium causes weak bones.

---