Varun's response does not address the question at all. The interviewer asked for a detailed approach to diagnosing and resolving a Kafka-based data pipeline lag issue without writing code. Varun's one-word response fails to provide any information on his diagnostic process, understanding of Kafka, or problem-solving skills. Varun should provide a step-by-step explanation of how he would investigate the issue, including the tools and metrics he would use, and the actions he would take based on his findings.