Which of the following is/are true about medullary carcinoma of thyroid? 1. Arises from parafollicular cells 2. Amyloid stroma is present on histology 3. 10-25% cases are familial 4. Diarrhoea occurs 5. Total thyroidectomy is performed
1,2,3 true and 4,5 false 1,2,4 true and 3,5 false 4,5 true and 1,2,3 false All are true