Final answer:
Ultrasound is the most common and safest imaging technique used to diagnose molar pregnancy.
Step-by-step explanation:
DX of GTD (Molar pregnancy) can be diagnosed using ultrasound. Ultrasonography is the most common and safest imaging technique used to diagnose molar pregnancy. It allows doctors to visualize the inside of the uterus and detect any abnormal growth, such as the presence of the characteristic grape-like clusters in molar pregnancy.