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
Indicator (s) of poor prognosis in the pott's spine is/are -a)  Healed vertebral lesionb) Grade IV pott's spinec)  Kyphotic angle > 60°d)  Short duratione) Acute onset
assistant
The correct answer is  None