A 3 months old infant is having thick scales on scalp with dandruff. Erythmatous scaly lesions on nasolabial folds are also present. Diagnosis is –
Information in this question are :-


3 months old infant
Erythmatous scaly lesions
Thick scales on scalp → Indicates cradle cap
Lesions on nasolabial folds
Dandruff


All these information (in combination) suggest the diagnosis of Infantile seborrheic dermatitis.
Besides seborrheic dermatitis, no other diseases given in options will have scalp lesions and dermatitis.
Atopic dermatitis
Seborrhic dermatitis
Xerotic eczema
Napkin dermatitis