Please select the eligibility criteria that correspond to the clinical trial below.
Title: N/A
Brief Summary: The purpose of this study is to compare the tolerability and acceptability of a formulation containing Hypertonic saline 7% (HS) alone and a formulation containing HS and Hyaluronic acid 0.1% in a population of Cystic Fibrosis (CF) patients who already showed poor tolerance to HS.


Options:
A: Inclusion Criteria:

* diagnosis of Cystic Fibrosis (genotyping and sweat test)
* \> 8 year-old
* clinically and therapeutically stable disease in the last 30 days;
* Forced Expiratory Volume in one second (FEV1) ≥ 50% of predicted value;
* intolerance (cough, throat irritation, saltiness) to previous administration of 5.8% hypertonic saline solution.

Exclusion Criteria:

* decrease in FEV1 \>15% after first inhalation of hypertonic saline;
* Burkholderia cepacia infection;
* infective exacerbation requiring antibiotic treatment in the 15 days preceding enrolment;
* patient non compliant to standard therapy;
* Lung transplant;
* Patient unable to perform reproducible spirometry;
* Intolerance to β2 bronchodilators;
* Concurrent enrolment in other clinical trials;
* Plasmatic creatinine and transaminases more than twice the normal values.
B: Inclusion Criteria:

* Males and females
* Age 7-12 years old
* Diagnosis of cystic fibrosis by sweat chloride \> 60 meq/L, or presence of two CFTR mutations known to cause CF
* Routinely treated with the short-acting bronchodilator albuterol
* FEV1 \> 90% of predicted values

Exclusion Criteria:

* FEV1 \< 90% of predicted values
* Routine use of hypertonic saline, mannitol, or amiloride
* Allergic bronchopulmonary aspergillosis (ABPA)
* Sputum colonization with Burkholderia cepacia or multiple antibiotic resistant organisms
* Evidence of a pulmonary exacerbation within past two weeks
* Treated with intravenous or oral antibiotics in the past two weeks for a pulmonary exacerbation
* Presence of an acute respiratory illness characterized by:

  * Coughing above baseline values
  * Wheezing
  * Respiratory distress
  * Hemoptysis
* Cannot perform the inhalation maneuvers that are required for drug inhalation or radioaerosol administration
C: Inclusion Criteria:

Patient Participant:

1. Participant was randomized into the SIMPLIFY study
2. Person with CF is ≥ 14 years of age at the time of randomization into SIMPLIFY
3. Is English speaking
4. Participant has provided consent (or assent if applicable) in the SIMPLIFY study to provide contact information and share data from the SIMPLIFY study with the QUEST study team
5. Participant has provided contact information via the QUEST portal
6. Is willing and able to adhere to the study requirements
7. Provides consent (or assent if applicable) for the QUEST study
8. Completed participation in the SIMPLIFY study (i.e. completed through Visit 3 or early withdrawal, if applicable)

Caregiver Participant:

1. Lives in the same household as a child with CF who is ≥ 14 years of age but \<18 years of age who meets the eligibility requirements for the QUEST study
2. Is English speaking,
3. Is willing and able to adhere to the study requirements
4. Provides consent for the QUEST study

Exclusion Criteria:

An individual who meets any of the following criteria will be excluded from participation in this study:

1. Any situation that, in the opinion of the Investigator, would compromise the safety of the patient or the quality of the data
D: Inclusion Criteria:

1. Confirmed diagnosis of CF established in neonatal period either via CF newborn screening (NBS) or because of symptoms typical for CF (e.g. meconium ileus), positive family history or positive prenatal screening and fulfilling at least one of the following three criteria:

   * sweat chloride ≥ 60mEq/L
   * two CF causing mutations of CFTR gen
   * alterations of transepithelial potential difference of nasal or rectal epithelia typical for CF.
2. Age at enrolment is 0 to 4 months.
3. Patient's and parent's ability to comply with medication use, study visits, and study procedures is judged by the investigator (therefore parents have to understand the character of the study and individual consequences).
4. Participation in this study is voluntary. Only patients, whose parents or legal guardians gave written consent, are included.

Exclusion Criteria:

1. Born \< 30 weeks gestation.
2. Prolonged mechanical ventilation in the first 3 months of life.
3. A significant medical disease or condition other than CF likely to interfere with the child's ability to complete the entire protocol.
4. Previous major surgery except for meconium ileus.
5. Other major organ dysfunction, excluding pancreatic or hepatic dysfunction or another condition due to cystic fibrosis.
6. Physical findings that would compromise the safety of the subject or the quality of the study data as determined by investigator.
7. History of adverse reaction to sedation.
8. Known hypersensitivity to study treatment.
9. Participation in other interventional studies at the same time.

Criteria, which lead to a displacement of the procedures in sedation until the child has recovered:

* Clinically significant upper airway obstruction as determined by investigator (e.g. severe laryngomalacia, markedly enlarged tonsils, significant snoring, diagnosed obstructive sleep apnoea).
* Acute intercurrent respiratory infection, defined as an increase in cough, wheezing, or respiratory rate with onset in 2 weeks preceding visit.
* Oxygen saturation \<95% before initial pulmonary function test or initial MRI.
* Severe gastroesophageal reflux, defined as persistent frequent emesis despite anti-reflux therapy.

Answer: A