Aryan, a 14-year–old boy presented with chronic diarrhea and weight loss. History reveals that he has repeated attacks of respiratory tract infections with Pseudomonas aeruginosa. His younger brother died from a severe respiratory infection at the age of 7. Which of the following agents is most likely to improve this patient’s condition

**Core Concept**
The underlying condition being tested is likely **Cystic Fibrosis (CF)**, a genetic disorder affecting the **cystic fibrosis transmembrane conductance regulator (CFTR)** protein, leading to abnormal **chloride ion transport** and thick, viscous secretions in various organs.

**Why the Correct Answer is Right**
Since the correct answer is not provided, I will explain the general approach to treating Cystic Fibrosis. In CF, the **CFTR protein dysfunction** leads to respiratory and gastrointestinal complications. Treatment often involves **mucolytic agents** or **CFTR modulators** to improve the function of the CFTR protein, reducing the viscosity of secretions and improving organ function.

**Why Each Wrong Option is Incorrect**
**Option A:** Without knowing the specific option, generally, any option that does not address the underlying **CFTR protein dysfunction** or the management of thick secretions would be incorrect.
**Option B:** Similarly, an option not focused on **mucolytic therapy** or **CFTR modulation** would not be the best choice.
**Option C:** An option that does not consider the **anti-infective** needs, especially for Pseudomonas aeruginosa, might be less ideal.
**Option D:** Any option that ignores the **pancreatic insufficiency** and **malabsorption** common in CF patients would be incorrect.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that **Cystic Fibrosis** patients often have **pancreatic insufficiency**, requiring **enzyme replacement therapy**, and are prone to **respiratory infections**, necessitating **prophylactic antibiotics** and **vaccinations**.

**Correct Answer:** Unfortunately, without the answer choices, the correct answer cannot be specified.

✓ Correct Answer: B. Pancreatic lipase