Which of the following is/are the example of reflex action?

Options

A. Saliva come in mouth after seeing tasty food
B. Cockroaches hide after seeing light
C. Flowers become close after sunset
D. All of the above

Explanation

### Step-by-Step Solution:

1. **Understanding Reflex Action**: Reflex action is defined as an involuntary and nearly instantaneous movement in response to a stimulus. It occurs without conscious thought and is a quick response to a specific situation.

2. **Analyzing Each Option**:
- **Option A**: "Saliva comes in the mouth after seeing tasty food."
- This is a reflex action because it is an involuntary response to the stimulus of seeing food. The body reacts by producing saliva without conscious thought.

- **Option B**: "Cockroaches hide after seeing light."
- This is also a reflex action. The cockroach's immediate reaction to light is an unplanned response to a stimulus that indicates danger or a change in environment.

- **Option C**: "Flowers become close after sunset."
- This action is a response to environmental changes (sunset) and is also considered a reflex action as it occurs without conscious decision-making by the plant.

3. **Conclusion**: Since all the options provided are examples of reflex actions, the correct answer is **D. All of the above**.