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
Tachycardia, nervousness, intolerance to heat and exophthalmos are seen in: 
Select and explain. 
A. Hyperthyroidism, B. Hypothyroidism, C. Hyperparathyroidism, D. Hypoparathyroidism
A: Hyperthyroidism
Answer: A: Hyperthyroidism 
Explanation: None