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
A patient presented with a 3.5 cms size lymph node enlargement, which was hard and present in the submandibular region. Examination of the head and neck did not yield any lesion. The next investigation to be done -
assistant
The correct answer is  None