Human dental formula is

Options

A. `2123//2123`
B. `2123//1223`
C. `1223//2123`
D. `1223//1223`

Answer

### Step-by-Step Solution:

1. **Understanding Dental Formula**: The dental formula represents the number and types of teeth in an organism's mouth. In humans, it indicates the arrangement of teeth in both the upper and lower jaws.

2. **Types of Teeth**: There are four main types of teeth in humans:
- **Incisors**: Used for cutting food.
- **Canines**: Used for tearing food.
- **Premolars**: Used for crushing and grinding food.
- **Molars**: Also used for grinding food.

3. **Counting Teeth**: In adults, the typical dental formula for humans is:
- **Upper Jaw**: 2 Incisors (I), 1 Canine (C), 2 Premolars (P), 3 Molars (M)
- **Lower Jaw**: 2 Incisors (I), 1 Canine (C), 2 Premolars (P), 3 Molars (M)

4. **Writing the Dental Formula**: The dental formula is written as:
- Upper jaw: 2 I, 1 C, 2 P, 3 M
- Lower jaw: 2 I, 1 C, 2 P, 3 M
- Combined, it is expressed as:
\[ \text{Dental Formula} = \frac{2 \, I \, 1 \, C \, 2 \, P \, 3 \, M}{2 \, I \, 1 \, C \, 2 \, P \, 3 \, M} \]

5. **Final Calculation**: Since there are two jaws, we multiply the counts by 2:
- Total number of teeth in adults = 32 (16 in each jaw).

6. **Conclusion**: The human dental formula is represented as:
\[ \text{Dental Formula} = \frac{2 \, 1 \, 2 \, 3}{2 \, 1 \, 2 \, 3} \times 2 \]