This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
Which of the following is true about Tetralogy of Fallot? 
Select and explain. 
A. Cyanosis is often present in the first few days of life, B. There is a right sided aoic arch in about 50% of cases, C. The murmur becomes so er during a cyano c spell as flow through the pulmonary valve is increased, D. There is an association with DiGeorge syndrome
D: There is an association with DiGeorge syndrome
Answer: D: There is an association with DiGeorge syndrome 
Explanation: There is an associa on with DiGeorge syndrome. Tetralogy of Fallot is the most common congenital cyano c hea condition. It may present with cyanosis in the first few days of life, though this is rare. Usually, it presents as a murmur detected in first few months of life or as hypercyano c spells in late infancy. A hot bath will increase cyanosis, as the vasodilator on results in a decrease in the peripheral vascular resistance, and so the flow through the pulmonary aery decreases, and cyanosis increases. During a cyano c spell the decrease (not increase) in flow through the pulmonary aery results in the murmur becoming so er or inaudible. There is a right-sided aor c arch in about 30% of cases.