This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Skin
Which of the following melanomas do not have an in situ growth phase? 
Select and explain. 
A. Superficial spreading melanoma, B. Nodular melanomas, C. Lentigo maligna melanoma, D. Desmoplastic melanoma
B: Nodular melanomas
Answer: B: Nodular melanomas 
Explanation: Nodular melanomas are the only type in which the malignant melanoma cells appear to have the capacity for invasive growth into the dermis and beyond from the beginning, without an in situ phase, and these tumours develop rapidly and is difficult to diagnose at an early stage. Ref: Rook's textbook of dermatology, 8th edition, Pg 54.36.