Okay, let's tackle this question about a 1-year-old with PDA. First, I need to recall what PDA stands for. Patent Ductus Arteriosus, right? That's a congenital heart defect where the ductus arteriosus doesn't close after birth. The question is asking which statement is true about a 1-year-old with PDA.

The options aren't provided, but the correct answer is given as option C. Wait, actually, looking back, the user just said the correct answer is option C or something? Wait, in the question, the options are labeled A through D, and the correct answer is given as ". [Answer Text]". But the user hasn't filled in the options. Hmm, maybe there's a mistake here. Wait, maybe the user provided a placeholder where the actual options would be. Oh, but in the problem statement, the options A, B, C, D are empty. So perhaps the actual question from the user had specific options, but in the provided text, they're missing. That complicates things a bit.

But wait, the user provided the correct answer as ". [Answer Text]" but didn't fill in the actual correct answer text. Wait, maybe the original question had specific options, but in the user's input, they left them blank. So the user is asking me to generate an explanation based on the correct answer they provided, which is missing the actual text. Hmm, this is confusing. How can I write an explanation without knowing the actual options and the correct answer's text?

Wait, perhaps the user made a mistake in formatting. Let me check again. The user's input is:

**Question:** True about 1 year old child with PDA is-

A.
B.
C.
D.

**Correct Answer:** .

So the correct answer is given as ". [Answer Text]", but the actual answer text isn't there. That's a problem. How can I write an explanation without knowing what the correct answer is? The user might have intended to include the correct answer but forgot. For example, if the correct answer was option C, and the options were something like "A. Left axis deviation", "B. Right ventricular hypertrophy", "C. Continuous machinery murmur", "D. Systolic ejection click", then the correct answer would be C. But without the actual options, how can I proceed?

Wait, maybe the user intended to provide the correct answer as part of the input. Let me check again. The user wrote:

**Correct Answer:** . [Answer Text]

But in the example, the user left the answer text blank. So perhaps the user is expecting me to generate an example explanation based on a hypothetical correct answer. But that's not possible without knowing the actual options and the correct answer. Alternatively, maybe the user is testing the system's ability to handle incomplete inputs. However, given the instructions, I need to generate a proper explanation for a given question and answer. Since the options and correct answer are missing, perhaps the user made a mistake in inputting the question.

Alternatively, maybe the user provided a placeholder where the actual question and answer would be. But since the user's input is as such, I need to make an assumption. Let me think of a typical PDA question. Common true statements about PDA in a 1-year-old include the presence

✓ Correct Answer: A. Symptoms similar to Aoo pulmonary window