This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: X-RAYS, Subject name: Radiology
[{'content': 'All are true about Modern Xray tube except? \nSelect and explain. \nA. It has a rotatory Cathode., B. Heat loss is mainly By Radiation., C. Rhenium is added to tungsten target at Anode., D. Chief source of Xray generation is by Bremstrahlung effect.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: - Modern X ray tube has a rotatory anode. - Motor is attached to the Anode to make it rotatory. - The Cathode is made of Tungsten alloyed with Thorium. - The Target of Anode is made of Tungsten Alloyed with Rhenium. - The major source of X RAY Generation in Modern X ray tube is Bremstrahlung Radiation/Braking Radiation.', 'role': 'assistant'}]