This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
High output cardiac failure is seen in: 
Select and explain. 
A. Thyrotoxicosis, B. Congestive cardiac failure, C. Corpulmonale, D. Aortic stenosis
A: Thyrotoxicosis
Answer: A: Thyrotoxicosis 
Explanation: None