<prompt> Answer this question truthfullyWhich diagnostic test is preferred for detecting follicular thyroid cancer?  <response>: <reason> Biopsy is the gold standard for diagnosing thyroid cancer. According to the American Joint Committee on Cancer AJCC, there are 4 stages of follicular thyroid cancer based on the clinical features and findings on imaging. Each stage is assigned a letter and a number that designate the tumor size, number of lymph node regions involved, and metastasis. 