This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: ULTRASOUND, Subject name: Radiology
[{'content': 'Evaluation of cardiac valve motion and fetal hea rate is done in which mode of Ultrasound? \nSelect and explain. \nA. A-mode, B. B-mode, C. M-mode, D. D-mode', 'role': 'user'}, {'content': 'Answer: C \nExplanation: M-Mode Ultrasound is Motion mode and is used to evaluate Fetal Hea Rate and Cardiac Valve movement and echocardiography. Also used for detection of pneumothorax. A Mode Ultrasound is Amplitude Mode for measuring Axial length of Eyeball and orbital biometry (A scan in Opthalmology is the A Mode Ultrasound) B Mode Ultrasound is most commonly used mode. It is Brightness mode for routine Ultrasound. M Mode used in antenatal scan to calculate feral hea rate.', 'role': 'assistant'}]