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: Dental
Elements of primary health care include all except: 
Select and explain. 
A. Safe water supply and sanitation, B. Treatment of common illness and injury, C. Essential Drugs, D. Referral services
D: Referral services
Answer: D: Referral services 
Explanation: Elements of Primary Health Care: 
E - Health Education (health problem & control). 
L - Locally Endemic disease (prevention & control). 
E - Essential drugs. 
M - MCH (Maternal & Child Health) including FP. 
E - EPI (Immunization against 6 Vaccine Preventable Diseases). 
N - Nutrition/ food supply. 
T - Treatment of common illness & injury. 
S - Safe water supply & Sanitation.