All are TRUE about hyperparathyroidism, except -: (A) Commonly occurs after thyroidectomy, (B) May cause hypercalcemia, (C) Solitary adenoma is the most common cause, (D) None of the above
Answer is A. Thyroid crisis or storm -
 It is a rare disorder nowadays 
It is an extreme form of thyrotoxicosis which is precipitated by stressful illness, thyroid surgery or Radioiodine administration.
 It presents with symptoms of thyrotoxicosis which are -
 Severe tachycardia, Arrhythmias
 Marked delirium
 Vomiting
 Diarrhoea
Dehydration
 High fever
 The mortality rate is very high.