<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 1-day-old infant born at full term by uncomplicated spontaneous vaginal delivery is noted to have cyanosis of the oral mucosa. The baby otherwise appears comfortable. On examination, his respiratory rate is 40min and pulse oximetry is 80. His left thumb is displaced and hypoplastic. A right ventricular lift is palpated, S1 is normal, S2 is single, and a harsh 36 systolic ejection murmur is heard at the left upper sternal border. Chest X-ray is shown. Which of the following is the most likely diagnosis?? A: Transposition of great vessels, B: Tetralogy of Fallot, C: Ventricular septal defect, D: Transient tachypnoea of the newborn, E: Pneumothorax,  <response>: Based on the clinical findings of cyanosis, tachypnea, low oxygen saturation, thumb abnormalities, and heart murmur in a newborn, this appears to be a case of cyanotic congenital heart disease. The chest X-ray shows a boot-shaped heart suggestive of tetralogy of Fallot. The murmur and single S2 support a diagnosis of tetralogy of Fallot, which classically consists of pulmonary stenosis, ventricular septal defect, overriding aorta, and right ventricular hypertrophy. Transposition of great vessels is less likely given the normal S1 and systolic murmur. VSD alone would not cause cyanosis in a newborn. Tachypnea of the newborn and pneumothorax would not cause the congenital thumb findings.B: Tetralogy of Fallot 