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: Microbiology
What is the chance of HIV infection after needle prick injury? 
Select and explain. 
A. 1/100, B. 1/300, C. 1/10000, D. 1 in 1 Lakh
B: 1/300
Answer: B: 1/300 
Explanation: Needle prick injury: HIV transmission following skin puncture from a contaminated needle is 0.3 % and a mucous membrane exposure is 0.09%. The seroconversion rate for HIV is 1:300, or 0.3% from a hollow-bore needle stick injury. Antiretroviral drugs as postexposure prophylaxis decreases the risk of infection. Must know: In Hepatitis B, the seroconversion ranges from 23 to 62%, with higher rates associated with patients who are HBeAg positive, as compared to HBeAG negative. The seroconversion rate for Hepatitis C is 1.8%. For Hepatitis C no prophylactic treatment is available. HBV post exposure prophlylaxis with hepatitis B immunoglobulin and initiation of Hep B vaccine is 90%effective. Ref: Harrison's Principles of internal medicine, 16th edition, page 1081.