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Thermography is the best answer because it specifically detects regions of heat and cold in the body, making it the most suitable diagnostic technique for this purpose. Ultrasound and X-ray do not have the ability to detect heat and cold regions in the body, as they primarily provide images of structures in the body. MRI, while it can detect changes in temperature, does not specifically target heat and cold regions like thermography does. Therefore, thermography is the most accurate and effective technique for detecting these regions.