Final answer:
Without additional context, it is impossible to determine how long it has been since Murugan worked at the doctor's house.
Step-by-step explanation:
Based on the information provided in the question, we cannot determine exactly how long it has been since Murugan worked at the doctor's house. Without additional context, it is impossible to determine how long it has been since Murugan worked at the doctor's house.
The question only gives options such as 'a few days,' 'a few weeks,' 'a few months', and 'a few years.' Without additional context, it is impossible to pinpoint the specific timeframe. To answer this question, we would need more information or context regarding Murugan and the doctor's house.