In a study, scientists compared the microbiomes of poorly nourished and well-nourished infants and young children. Gut microbes were isolated from faecal samples of malnourished and healthy children. The microbiome was “immature” and less diverse in malnourished children compared to the better developed “mature” microbiome found in healthy children of the same age. According to some studies, the chemical composition of mother’s milk has shown the presence of a modified sugar (sialylated oligosaccharides). This is not utilized by the baby for its own nutrition. However, the bacteria constituting the infant’s microbiome thrive on this sugar which serves as their food. Malnourished mothers have low levels of this sugar in their milk. Consequently, the microbiomes of their infants fail to mature. That in turn, leads to malnourished babies.

Question: On the basis of the above passage, the following assumptions have been made:
1. Processed probiotic foods are a solution to treat the children suffering from malnutrition due to immature gut bacteria composition.
2. The babies of malnourished mothers generally tend to be malnourished.
Which of the above assumptions is/are valid?

The correct option is 2 only.

Step-by-step Explanation:

To determine the validity of the assumptions based on the provided passage, let us analyze each assumption individually:

Analysis of Assumption 1:
The passage describes how sialylated oligosaccharides (a modified sugar in mother's milk) serve as food for the infant's microbiome. It highlights that the lack of this sugar in malnourished mothers' milk leads to immature microbiomes and consequently malnourished babies. However, the passage does not mention or discuss "processed probiotic foods" or their efficacy as a solution to treat malnutrition. Therefore, Assumption 1 is an extraneous assumption that cannot be logically derived from the text, making it invalid.

Analysis of Assumption 2:
The passage explicitly states: "Malnourished mothers have low levels of this sugar in their milk. Consequently, the microbiomes of their infants fail to mature. That in turn, leads to malnourished babies." This direct causal chain establishes that babies of malnourished mothers generally tend to be malnourished because of the low levels of sialylated oligosaccharides in the mother's milk. Thus, Assumption 2 is a valid assumption directly supported by the passage.

Since only Assumption 2 is valid, the correct choice is 2 only.