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: Surgery
Cardiovascular manifestation are more dominant in: 
Select and explain. 
A. Primary thyrotoxicosis, B. Secondary thyrotoxicosis, C. Simple goitre, D. All of the above
B: Secondary thyrotoxicosis
Answer: B: Secondary thyrotoxicosis 
Explanation: None