code: def _to_DM(A, ans):
      """Convert the answer to DomainMatrix."""
      if isinstance(A, DomainMatrix):
          return A.to_dense()
      elif isinstance(A, Matrix):
          return A.to_DM(ans.domain).to_dense()
  
      if not (hasattr(A, "shape") and hasattr(A, "domain")):
          shape, domain = ans.shape, ans.domain
      else:
          shape, domain = A.shape, A.domain
  
      if isinstance(A, (DDM, list)):
          return DomainMatrix(list(A), shape, domain).to_dense()
      elif isinstance(A, (SDM, dict)):
          return DomainMatrix(dict(A), shape, domain).to_dense()
      else:
          assert False
  
imports: from sympy import ZZ, QQ, ZZ_I, EX, Matrix, eye, zeros, symbols
  from sympy.polys.matrices import DM, DomainMatrix
  from sympy.polys.matrices.dense import ddm_irref_den, ddm_irref
  from sympy.polys.matrices.ddm import DDM
  from sympy.polys.matrices.sdm import SDM, sdm_irref, sdm_rref_den
  import pytest
label_desc: Use image node_id 1 for calling a global function with example usage: _to_DM(A, ans) and returns: A, DomainMatrix, A, DomainMatrix