to exercise due skill in performing the surgery. 17. In Jacob Mathews (supra) this Court held that a professional may be held liable for negligence if he is not possessed of the requisite skill which he supposes to have or has failed to exercise the same with reasonable competence. The complainant has not adduced any evidence to establish that Dr. Neeraj Sud or the PGI were guilty of not exercising the expertise or the skill possessed by them, so as to hold them liable for negligence. No evidence was produced of any expert body in the medical field to prove that requisite skill possessed by Dr. Neeraj Sood was not exercised by him in discharge of his duties. 18. In other words, simply for the reason that the patient has not responded favourably to the surgery or the treatment administered by a doctor or that the surgery has failed, the doctor cannot be held liable for medical negligence straightway by applying the doctrine of Res Ipsa Loquitor unless it is established by evidence that