This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Medicine
In Thyrotoxicosis, B-blockers do not control - 
Select and explain. 
A. Anxiety, B. Termors, C. Tachycardia, D. Oxygen consumption
D: Oxygen consumption
Answer: D: Oxygen consumption 
Explanation: Beta blockers ameliorate the symptoms of hypehyroidism that are caused by increased beta-adrenergic tone. These include palpitations, tachycardia, tremulousness, anxiety, and heat intolerance. n many tissues, hypehyroidism is associated with an increased number of beta-adrenergic receptors . The ensuing increase in beta-adrenergic activity is responsible for many of the symptoms associated with this disorder. It also explains the ability of beta blockers to ameliorate rapidly many of the symptoms, including palpitations, tachycardia, tremulousness, anxiety, and heat intolerance. Ref - pubmed.com