¿Cuál es el método más específico para diagnosticar la espondilitis anquilosante?
	A: HLA B27
	B: "B/l sactoilitis" does not appear to be a complete sentence or phrase in English, so it is difficult to provide an accurate translation without more context. Please provide additional information or a complete sentence to get an accurate translation.
	C: "Movimiento lumbar"
	D: ESR
	
"B/l sactoilitis" does not appear to be a complete sentence or phrase in English, so it is difficult to provide an accurate translation without more context. Please provide additional information or a complete sentence to get an accurate translation.