To determine the quantity of hydrocortisone 2.5% cream in grams to be entered on the compounding record, we need to calculate how much of each component is required for a total of 4 oz, given that the ratio is 1:1.

1. Convert the total quantity from ounces to grams:
   • 1 oz = 28.35 grams
   • 4 oz = 4 × 28.35 grams = 113.4 grams
2. Since the ratio is 1:1, half of the total weight will be hydrocortisone 2.5% cream and half will be Aquaphor:
   • Quantity of hydrocortisone 2.5% cream = 113.4 grams / 2 = 56.7 grams

Therefore, the correct quantity of hydrocortisone 2.5% cream to be entered on the compounding record is:

B. 60 grams

This is because the closest option to 56.7 grams provided in the choices is 60 grams.

To solve this problem, we need to find the quantity of hydrocortisone 2.5% cream required for the compounded preparation.
Given information:

• The prescription calls for a 1:1 ratio of hydrocortisone 2.5% cream and Aquaphor.
• The total quantity of the compounded preparation is 4 oz.

Since the ratio of hydrocortisone 2.5% cream and Aquaphor is 1:1, we can divide the total quantity by 2 to find the quantity of each component.
Step 1: Convert the total quantity from ounces to grams. 1 oz = 28.35 g 4 oz = 4 × 28.35 g = 113.4 g
Step 2: Calculate the quantity of hydrocortisone 2.5% cream required. Quantity of hydrocortisone 2.5% cream = Total quantity × (1/2) Quantity of hydrocortisone 2.5% cream = 113.4 g × (1/2) = 56.7 g
Therefore, the quantity of hydrocortisone 2.5% cream that should be entered on the compounding record is 56.7 g.
The closest answer choice to 56.7 g is B. 60 g.
Therefore, the correct answer is B. 60 g.