Consider the following pairs:1. Nankai Trough: Situated off the south...
1. Nankai Trough: Situated off the southwest Pacific coast of Japan - Correct
The Nankai Trough is indeed located off the southwest Pacific coast of Japan.
2. Ring of Fire: Area encompassing the Pacific Ocean with frequent earthquakes and volcanic activity - Correct
The Ring of Fire is a major area in the Pacific Ocean basin where many earthquakes and volcanic eruptions occur.
3. Magnitude 9.0 Earthquake: Triggered a tsunami and nuclear disaster in 2004 - Incorrect
The magnitude 9.0 earthquake that triggered a tsunami and nuclear disaster in Japan actually occurred in 2011, not 2004.
4. Clinical Trials Registry-India: Maintained by Central Drugs Standard Control Organisation (CDSCO) - Incorrect
The Clinical Trials Registry-India (CTRI) is maintained by the Indian Council of Medical Research (ICMR), not by the Central Drugs Standard Control Organisation (CDSCO).
Pairs 1 and 2 are correctly matched, while pairs 3 and 4 are incorrectly matched.