**Core Concept**
Vaccine-associated paralytic poliomyelitis (VAPP) is a rare complication of oral poliovirus vaccine (OPV) administration, where the live, attenuated virus in the vaccine strain causes poliomyelitis in the recipient. The incubation period of VAPP is a critical factor in understanding the timing of its onset.

**Why the Correct Answer is Right**
The incubation period of VAPP is typically short, ranging from 1-3 weeks, with a median of 7-10 days. This is because the live, attenuated virus in the OPV strain can replicate rapidly in the host, leading to the development of paralytic poliomyelitis. The short incubation period of VAPP is in contrast to the longer incubation period of poliomyelitis caused by wild-type poliovirus, which can range from 7-14 days to several months.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not reflect the established incubation period of VAPP.
**Option B:** This option is incorrect because it is not supported by scientific evidence and is not a recognized incubation period for VAPP.
**Option C:** This option is incorrect because it is longer than the established incubation period of VAPP.

**Clinical Pearl / High-Yield Fact**
It is essential to note that VAPP is a rare but serious complication of OPV administration, and its incidence has decreased significantly with the introduction of inactivated poliovirus vaccine (IPV) in many countries.

**Correct Answer:** B. 4-6 weeks