A mother had diarrhoea. She was making a meal for her child but did not wash her hands before preparing the food and her child became sick with diarrhoea. Can you identify the source and the pathway of disease transmission?a.The source is the mother → excreta → fingers → food → mouthb.The source is the excreta → mother → fingers → food → mouthc.The source is the food → excreta → fingers → mother → mouthd.The source is the environment → excreta → fingers → food → mouth

The correct answer is a. The source is the mother → excreta → fingers → food → mouth.

Here's the step-by-step explanation:

1. The mother, who had diarrhoea, is the source of the disease-causing pathogens.

2. These pathogens are present in her excreta.

3. She did not wash her hands after using the toilet, so the pathogens transferred from her excreta to her fingers.

4. She then prepared food for her child, so the pathogens transferred from her fingers to the food.

5. When the child ate the food, the pathogens entered the child's body through the mouth, causing the child to become sick with diarrhoea.

So, the pathway of disease transmission in this case is: mother (source) → excreta → fingers → food → mouth (entry into new host).