Which technique is commonly used to produce virus-resistant plants?

Explanation

**Step-by-Step Solution:**

1. **Understanding the Problem**: The question asks for the technique commonly used to produce virus-resistant plants. This involves identifying a method that effectively eliminates viruses from plants.

2. **Historical Context**: In 1952, scientists G. Morrill and C. Martin developed a method to produce virus-free shoots from virus-infected dahlia plants. This historical reference is crucial as it highlights the early application of the technique.

3. **Identifying the Technique**: The technique used by Morrill and Martin is known as "shoot meristem culture," which is a form of tissue culture. This technique involves taking the apical meristem (the growing tip of the plant) which is typically free from viruses.

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