Q: 42 (CAPF/2010)

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Which of the following are the risk factors in the transmission of the HIV infection ?
1. Smoking and drinking alcohol
2. Observing bad hygiene
3. Blood transfusion
4. Unprotected sex
Select the correct answer using the code given below :
question_subject: 
Science
question_year: 
2010
question_exam: 
CAPF
stats: 
0,1264,128,24,1264,64,40