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
all of the following are features of thyrotoxicosis, except - 
Select and explain. 
A. Diastolic murmur, B. tremors, C. Irregularly, irregular pulse, D. osteoporosis
A: Diastolic murmur
Answer: A: Diastolic murmur 
Explanation: Ref - Davidsons 23e p637