This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastrointestinal tract, Subject name: Pediatrics
Which of the is the earliest indicator of pathological gastroesophageal reflux in infants (GERD) 
Select and explain. 
A. Respiratory Symptoms, B. Postprandial Regurgitation, C. Upper GI Bleed, D. Stricture Esophagus
A: Respiratory Symptoms
Answer: A: Respiratory Symptoms 
Explanation: GERD has been associated with significant respiratory symptoms in children and infants. other symptoms vomiting regurgitation weight loss dysphagia and odynophagia chest pain hematemesis recurrent pneumonia,apnea,wheezing stridor ,hoarseness,cough,abnormal neck posturing Ref : ESSENTIAL PEDIATRICS,O.P.GHAI,PG NO:253,7th edition