system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Which of the following is initial investigation of choice for a patient presenting with solitary nodule of thyroid: March 2005
assistant
The correct answer is  Ultrasound is the preferred imaging modality for thyroid nodules, and the ultrasound guided fine needle aspiration biopsy (FNAB) is the preferred method of tissue.