<prompt> A patient with carcinoma lower 13 of oesophagus, receives chemo Radiotherapy and dysphagia shows complete response. What is the next step in management?ReassureFollow with CT scan every 6 monthsEsophagectomyEUS to look for residual disease  <response>: - Clinical trials and meta-analyses have shown that a C surgery regimen could significantly improve the survival of locally advanced esophageal carcinoma patients compared to surgery alone - Endoscopic biopsy, endoscopic ultrasonography, MRI at various sequences and PET-CT all had shocomings for evaluating cCR and the therapeutic effect of cCR concurrent chemoradiation and nC Neoadjuvant chemoradiation therapy 