Step 1: Frame the question medically, not legally.
A medical termination of pregnancy at 28 weeks for a congenital anomaly is a clinical decision. The team needed is one that can diagnose the anomaly, confirm it on imaging, perform/manage the procedure and assess the fetus - i.e., medical and diagnostic specialists.
Step 2: Identify who each clinician contributes.
• Obstetrician - conducts and manages the termination procedure itself.
• Sonologist - performs detailed ultrasound to confirm and characterise the anomaly.
• Pediatrician (neonatologist) - assesses fetal/neonatal viability and condition.
These three are genuinely required for the medical assessment.
Step 3: Spot the non-medical role.
A lawyer adds no clinical input. The legal permissibility is handled by following the statutory framework and the opinion of the registered medical practitioners; a lawyer's physical presence is not part of the medical board needed for this decision.
Step 4: Conclude.
Of the four, the presence not required is the lawyer.
Final answer: Option 2 - Lawyer.