This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
The most impoant cause of under 5 moality worldwide is: 
Select and explain. 
A. Diarrhoea, B. Malnutrition, C. Respiratory infections, D. Trauma
C: Respiratory infections
Answer: C: Respiratory infections 
Explanation: Lower respiratory tract infections are the leading cause of morbidity worldwide between age group of 1 to 5. Other causes are, diarrheal illness, measles, malaria, human immunodeficiency virus infection/acquired immunodeficiency syndrome. At Ref: Goldman R.D., Meckler G.D. (2011). Chapter 110. Emergency Care of Children. In J.E. Tintinalli, J.S. Stapczynski, D.M. Cline, O.J. Ma, R.K. Cydulka, G.D. Meckler (Eds), Tintinalli's Emergency Medicine: A Comprehensive Study Guide, 7e.