Assertion (A): Zener diode is used as a voltage regulator.
Reason (R ): Zener diode operated in reverse biased condition.

Options

A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is NOT the correct explanation of A
C. A is true but R is false
D. A is false and R is true

Explanation

To solve the question regarding the assertion and reason about the Zener diode, we can break down the solution into clear steps:

### Step 1: Understand the Assertion
The assertion states that "Zener diode is used as a voltage regulator." This is a well-known application of the Zener diode. It is specifically designed to maintain a constant voltage across its terminals when reverse-biased.

**Hint:** Think about the primary function of a Zener diode in electronic circuits.

### Step 2: Understand the Reason
The reason given is that "Zener diode operated in reverse biased condition." This is true. A Zener diode must be reverse-biased to function as a voltage regulator. In this condition, it can maintain a stable output voltage.

**Hint:** Recall how Zener diodes behave when reverse-biased compared to regular diodes.

### Step 3: Analyze the Relationship Between Assertion and Reason
Both the assertion and reason are true. However, we need to determine if the reason correctly explains the assertion. While the Zener diode does operate in reverse bias to regulate voltage, the assertion about its use as a voltage regulator is broader and does not solely depend on the reverse bias condition.

**Hint:** Consider whether the reason provides a complete explanation for the assertion or if it merely supports it.

### Step 4: Conclusion
Since both the assertion and reason are true, but the reason does not correctly explain the assertion, we conclude that the correct answer is: "Both assertion and reasoning are true, but R is not the correct explanation of A."

**Hint:** Look for options that differentiate between the truth of the statements and their explanatory power.

### Final Answer
The correct choice is: "Both assertion and reasoning are true, but R is not the correct explanation of A."