Opening/s of digestive system to the exterior is/are ____.

Options

A. mouth
B. anus
C. gullet
D. Both (a) and (b)

Explanation

To solve the question "Opening/s of digestive system to the exterior is/are ____", we can follow these steps:

1. **Identify the Openings of the Digestive System**: The digestive system has two main openings that connect it to the exterior of the body. The first is the mouth, which is where food enters the digestive system. The second is the anus, which is where waste is expelled from the body.

2. **Consider the Options Given**: The options provided are:
- A) Mouth
- B) Anus
- C) Throat
- D) Both A and B

3. **Analyze Each Option**:
- **Option A (Mouth)**: This is indeed an opening of the digestive system as it is where food intake occurs.
- **Option B (Anus)**: This is also an opening of the digestive system as it is where the waste exits the body.
- **Option C (Throat)**: While the throat is part of the digestive system, it does not connect directly to the exterior; it is an internal passage.
- **Option D (Both A and B)**: Since both the mouth and anus are openings to the exterior, this option is valid.

4. **Conclusion**: Since both the mouth and anus are openings to the exterior of the digestive system, the correct answer is option D, which states "both A and B".

Final Answer: **D) Both A and B**