Cretinism is characterized by :

Question

Accepted Answer

Cretinism is a condition that arises due to severe deficiency of thyroid hormones, particularly during fetal development and early childhood. This deficiency leads to significant impairments in both physical and mental development. Here's why Option 2, "Retarded physical and mental growth," is the correct answer:

1. **Explanation for Option 2:**
   - **Retarded Physical Growth:** In individuals with cretinism, the lack of thyroid hormones results in stunted growth, leading to shorter stature and delayed skeletal development. This is because thyroid hormones are crucial for normal growth and development.
   - **Retarded Mental Growth:** The deficiency also affects brain development, leading to intellectual disabilities and cognitive impairments. This is due to the essential role of thyroid hormones in brain maturation and function.
   - Overall, cretinism is characterized by a combination of these physical and mental growth delays, making Option 2 the most accurate description of the condition.

2. **Explanation for why other options are incorrect:**
   - **Option 1: Low haemoglobin levels:** While thyroid hormone deficiency can affect metabolism and overall health, low haemoglobin levels are not a defining characteristic of cretinism. Anemia can occur due to various other reasons, but it is not specifically linked to cretinism.
   - **Option 3: Spoon shaped nails:** Spoon-shaped nails, or koilonychia, are typically associated with iron deficiency anemia and are not a symptom of cretinism. This condition is unrelated to thyroid hormone deficiency.
   - **Option 4: Bow legs:** Bow legs can be a result of vitamin D deficiency (rickets) or other bone development issues, but they are not a characteristic feature of cretinism. Cretinism primarily affects overall growth and mental development rather than causing specific bone deformities like bow legs.

In conclusion, Option 2 is the correct answer because cretinism is specifically characterized by retarded physical and mental growth due to thyroid hormone deficiency. The other options describe symptoms or conditions that are not directly related to cretinism.