<prompt> In valvular hea disease complicating pregnancy the following statements are true except :A closed mitral valvotomy can be carried out if symptoms of mitral stenosis are severeOpen hea surgery is associated with a reduction in fetal lossMitral regurgitation is usually well toleratedA maternal moality of 15 has been repoed in women with critical aoic stenosis  <response>: Open hea surgery is associated with a reduction in fetal loss 