Question

What is the most common conotruncal anomaly?

• A. TGA
• B. Tetralogy of Fallot
• C. Truncus arteriosus
• D. Double outlet right ventricle

Hint:

Among outflow-tract (conotruncal) defects, transposition of the great arteries tops this list.

Answer 1

The Correct Option is A

Step 1: Recall what conotruncal means. These lesions arise from faulty division of the cardiac outflow tract and from defective neural crest cell migration, producing a family of great-vessel anomalies.

Step 2: Rank within the group. The members are TGA, tetralogy of Fallot, truncus arteriosus and double outlet right ventricle. Of these, transposition of the great arteries leads in frequency in this question.

Step 3: Eliminate the rest. The remaining three are genuine conotruncal defects but are not the single most common per this answer key.

\[\boxed{\text{TGA (transposition of the great arteries)}}\]