Final answer:
To convert the patient's age from years to months, multiply the years (25) by the number of months in each year (12), which equals 300 months.
Step-by-step explanation:
The question is asking to calculate the age of a patient in months given that the patient is 25 years old. There are 12 months in a year, so to find the patient's age in months, we multiply the number of years (25) by the number of months in a year (12). The calculation would be:
25 years × 12 months/year = 300 months
Therefore, the age of the patient in months is 300 months, which corresponds to option D).