What is usually present at the time of asphyxiation ?

Options

A. (a) oxyhemoglobin
B. (b) methemoglobin
C. carbaminohemoglobin
D. (d) carboxyhemoglobin

Answer

To answer the question "What is usually present at the time of asphyxiation?", we need to analyze the condition of asphyxiation and the options provided.

### Step-by-Step Solution:

1. **Understanding Asphyxiation**: Asphyxiation occurs when there is an obstruction in the breathing pathway, leading to inadequate oxygen supply to the body. This can happen due to various reasons such as choking on food, strangulation, or drowning.

2. **Identifying the Effects of Asphyxiation**: When asphyxiation occurs, the body experiences a lack of oxygen (hypoxia) and an accumulation of carbon dioxide (hypercapnia) due to the inability to breathe properly.

3. **Analyzing the Options**:
- **A. Oxyhemoglobin**: This is hemoglobin bound to oxygen. Since asphyxiation leads to a deficiency of oxygen, oxyhemoglobin would not be present.
- **B. Methemoglobin**: This form of hemoglobin is produced due to exposure to certain toxins or chemicals, leading to a condition known as methemoglobinemia. It is not directly related to asphyxiation.
- **C. Carboaminohemoglobin**: This is hemoglobin that is bound to carbon dioxide. During asphyxiation, the lack of oxygen leads to an increase in carbon dioxide levels in the blood, resulting in higher levels of carboaminohemoglobin. This is a key indicator of asphyxiation.
- **D. Carboxyhemoglobin**: This is hemoglobin bound to carbon monoxide, which occurs in carbon monoxide poisoning, not asphyxiation.

4. **Conclusion**: The correct answer is **C. Carboaminohemoglobin**, as it is present at the time of asphyxiation due to the increased concentration of carbon dioxide in the blood.

### Final Answer:
C. Carboaminohemoglobin