You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Tetralogy of Fallot's present with one of the following – and explain in detail?
Clinical features of TOF :

Dyspnea on exertion and exercise intolerance → Most common.
Cyanosis usually presents after the neonatal period
Hypoxemic or cyanotic spells (Tet spells)
Commonest congenital lesion with which squatting is used
Clubbing

Auscultatory findings :

S1 →  Normal
S2 →  Single predominantly Aortic
Murmur →  Ejection systolic
TOF patients are RARELY CYANOTIC AT BIRTH

Chest x-ray

Normal heart size
Oligaemic lung fields
Right aortic arch present in 25% case
BOG → Right axis deviation, Inverted Twave, `P' pulmonale

About option ‘b’

Pulmonary stenosis causes pressure overload → Concentric right ventricular hypertrophy without cardiac enlargement.