This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thyroid Tumor, Subject name: Pathology
Which of the following are features of diffuse sclerosing variant of papillary carcinoma? 
Select and explain. 
A. Occurs in young individuals including children, B. Extensive fibrosis throughout the gland, C. Associated with lymphocytic infiltrate, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Diffuse sclerosing variant of papillary carcinoma occurs in younger individuals, including children. This tumor has prominent papillary growth pattern intermixed with solid areas containing nests of squamous metaplasia. As the name suggests, there is extensive, diffuse fibrosis throughout thyroid gland, often associated with prominent lymphocytic infiltrate, simulating Hashimoto thyroiditis.