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: Physiology
Most common form of hyperthyroidism is 
Select and explain. 
A. Toxic goiter, B. Grave’s disease, C. Thyrotoxicosis, D. All of the above
B: Grave’s disease
Answer: B: Grave’s disease 
Explanation: None