**Question:** Child sex ration is -

A. 100 boys to 100 girls
B. 100 boys to approximately 105 girls
C. 100 boys to approximately 107 girls
D. 100 boys to approximately 107.5 girls

**Correct Answer:** D. 100 boys to approximately 107.5 girls

**Core Concept:** Sex Ratio is the ratio of male to female births.

**Why the Correct Answer is Right:**
Sex ratio is the proportion of male births to female births. In a healthy population, the sex ratio is expected to be close to 1 (100:100). However, several factors can influence this ratio, including genetic, hormonal, nutritional, and cultural influences.

**Why Each Wrong Option is Incorrect:**
A. The correct sex ratio is not represented (100:100).
B. This option is close but still incorrect, as the correct answer is closer to 107.5 girls per 100 boys.
C. This option is slightly inaccurate, as the correct answer is approximately 107.5 girls per 100 boys.
D. The correct answer is closer to 107.5 girls per 100 boys, which is the most accurate representation of the sex ratio in a healthy population.

**Why Option D is Right:**
The sex ratio is influenced by several factors. These factors can cause a deviation from the expected 1:1 ratio. One significant factor is human papillomavirus (HPV). HPV infection during pregnancy can lead to an increased risk of preterm birth, low birth weight, and perinatal mortality in female babies. As a result, there may be more male infants surviving to adulthood, leading to an apparent increase in the male to female ratio.

**Why Option D is Incorrect:**
Option D is incorrect because it focuses on the HPV-related factors, which are one of the contributing factors to the observed deviation in sex ratio. However, the actual sex ratio is more accurately represented as approximately 107.5 girls per 100 boys, rather than 107.5 girls to 100 boys.

**Clinical Pearl:**
Understanding the factors affecting sex ratio is crucial in clinical practice, particularly in societies with cultural practices that favor male children. This knowledge can help healthcare professionals provide appropriate counseling and support to expectant parents and families regarding perinatal care and gender-based inequalities.