The answer is dry, coarse hair. Milady's consultation guidance states directly that dry, coarse hair may require a humectant-rich moisturizing conditioner to increase manageability.
That's paired, in the same passage, with the opposite recommendation for a different hair type: heavy, cuticle-coating conditioners can weigh down fine hair, leaving it flat or oily. The two facts sit right next to each other in the book precisely because they're meant to be contrasted on the exam.
Milady Standard Barbering, 6th ed., Ch. 11 (Treatment of the Hair and Scalp), p. 281: "Dry, coarse hair may require a humectant-rich moisturizing conditioner to increase manageability."
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