<prompt> True about mapleson D circuit isFGF for spontaneous ventilation is equal to minute ventilationExpiratory valve is closer to patient1.8 times the minute ventilation is required gas flow for controlled ventilation.Preferred circuit for spontaneous ventilation.  <response>: Expiratory valve is away from the patient end in mapleson D circuit. 3 times minute ventilation is required for spontaneous ventilation.Mapleson A is the preferred circuit for spontaneous ventilation. 