Question:  National Stadium station is linked by skybridge to a shopping mall that contains how many shops?
Sentence (from "National Stadium BTS Station"): National Stadium station (Thai: สถานีสนามกีฬาแห่งชาติ ; RGTS: Sanam Kila Haeng Chat) is a BTS Skytrain station, on the Silom Line in Pathum Wan District, Bangkok, Thailand.
Relevant evidence: Yes