Final answer:
The medulla is the innermost layer of the hair shaft and can present different patterns. The types of the medulla include continuous, interrupted, fragmented, or absent. The correct type of medulla from the options provided is 'Continuous'.
Step-by-step explanation:
The type of medulla being referred to in the question is related to the structure of hair. The medulla is the innermost layer of the hair shaft, which can have different appearances based on its structure. The correct answer among the provided options is B. Imbricate.
There are several types of medulla patterns in the hair shaft, including continuous, interrupted, fragmented, or absent (no medulla). Continuous means that the medulla runs unbroken throughout the length of the hair shaft. Imbricate refers to overlapping scales on the outer layer of the hair strand, which is the cuticle, not the medulla itself, so this is indeed not a type of medulla either. However, if we're strictly discussing the options provided and considering this to be a multiple-choice question where 'Imbricate' is listed as a potential medulla type, there could be a mistake in the question. Nonetheless, 'Continuous' is a recognized type of medulla for the hair shaft.
On the other hand, 'Red' and 'Curly' are descriptors of the appearance and texture of the hair, not types of medulla.