Which one of the following pairs is not correctly matched? Recent Scientific Achievement — Country
- ACreating the world's first cloned dog : South Korea
- BCloning a human embryo for the first time : South KoreaCorrect
- CGuiding a spacecraft for collision with a comet : United States of America
- DLanding a spacecraft on an asteroid : Japan
Explanation
The correct answer is B because the first successful cloning of a human embryo was achieved by scientists in the United States, not South Korea.
Analysis of options: A) Creating the world's first cloned dog : South Korea - Correctly matched. The first cloned dog, Snuppy, was created by South Korean scientists in 2005. B) Cloning a human embryo for the first time : South Korea - Incorrectly matched. While South Korea was involved in cloning research, the first verified successful cloning of a human embryo was reported by a team in the United States in 2013. C) Guiding a spacecraft for collision with a comet : United States of America - Correctly matched. NASA's Deep Impact mission in 2005 involved a spacecraft colliding with Comet Tempel 1. D) Landing a spacecraft on an asteroid : Japan - Correctly matched. Japan's JAXA successfully landed its Hayabusa spacecraft on the asteroid Itokawa in 2005, and Hayabusa2 on Ryugu in 2018.

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